Download all answers in PDF file format or download Offline apps to use all the contents offline without internet. So, 10th Science chapter 10 question answers are useful for UP Board students. Properties of images formed by a necrt mirrors: i The image formed dufference a plane mirror is virtual and erect.
Properties of the image formed by a convex mirror: i This image is always virtual and erect. Laws of refraction of light: The refraction of light obeys the 10tu two laws: First law: The incident ray, the refracted ray and normal to the surface of separation at the point of incidence, all lie in the same plane.
Second law: The ratio of the sine of the angle of incidence and the sine of the angle of refraction is constant for a given pair of media. The ratio n2 is called zolutions index of the second medium with respect to the first medium.
Refraction of light: The phenomenon of bending of light from its straight line path as it passes obliquely from ncert solutions class 10th light difference transparent medium to another lifht called refraction of light. The path of the ray of light in the first medium is called incident ray. The liight of the ray of light in the second medium is called refracted ray. The solurions between the incident ray and the normal at the surface of ncert solutions class 10th light difference is called angle of incidence i.
The angle between the refracted ray and the normal at the surface of separation is called angle of refraction r. Question 1: Give three points of difference between real and virtual images. Answer 1: Real Image: i Here the rays actually meet at the image point.
Question 2: Distinguish ncert solutions class 10th light difference a concave and convex lens. Answer 2: Convex lens dkfference It is thicker at the centre than at the edges.
Concave lens: a It is thinner at the centre than at the edges. Question 1: Define the principal focus of a concave mirror. Calculate the focal length of the mirror of radius of curvature of 20 cm. Answer 1: The principal focus of concave mirror is a point on its principal axis at which a beam of light parallel to the principal axis differrence converges after reflection from the mirror.
Question 2: State the type of mirror preferred as i rear view mirror in vehicles, ii shaving mirror. Justify your answer giving two reason in each case. Answer 2: i A convex mirror is preferred as a rear-view mirror because a It always forms an erect, virtual and diminished image of an object placed anywhere in front of it.
This suggests that the speed of light in diamond will reduce by ncdrt factor 2. The S. It is denoted by D. Important questions and CBSE previous years board questions ncert solutions class 10th light difference to chapter 10 are given with answers. 10tj four properties of the image formed by a plane mirror. List the four properties of the image formed by a convex mirror. State the laws of refraction of ncert solutions class 10th light difference. What is meant by refraction of light?
Important Questions on 10th Science Chapter 10 Define the differrence focus of a concave mirror. Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror. Differecne radius of curvature of a spherical mirror is 20 cm.
What is its focal length? Name the mirror that can give an erect and enlarged image of an object. When an object is placed between the pole and the principal focus of a concave mirror, the image formed ncedt virtual, erect, and enlarged. Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Convex mirrors give a virtual, erect, and diminished image of the objects ncert solutions class 10th light difference in front of. They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind.
A ray of light travelling in air enters ncert solutions class 10th light difference into ncert solutions class 10th light difference. Does the light ray bend towards the normal or away from the normal? The light ray bends towards the normal. When a ray of light travels from soljtions optically rarer medium to an optically denser medium, it gets bent towards the normal. Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal.
The refractive index of diamond is 2. Sllutions is the meaning of this statement? Define 1 dioptre of power of a lens. Power of lens is defined as the reciprocal of its focal length.
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Using these solutions, students can solve questions and have a better understanding of the concepts. You can find the solved exercises for Class 10 Science Chapter 10 below.
Chapter Description: Light has been a major topic of study in Physics and Mathematics from ancient times to the present day. We will also learn to calculate the image position, nature, and its magnification produced by a spherical mirror by using Mirror Formula. We will also learn about the Lens Formula , Magnification , the Power of the Lens , and how to calculate the image position, nature, and its magnification produced by a spherical lens.
Some of the benefits are given below:. You can start your preparation for the 10th Science exam with the help of the solutions as well as other resources provided by Embibe. We hope you make the best use of these resources to score high in Class 10 board exams. If you have any questions, feel free to post them below.
We will get back to you at the earliest. Stay tuned on embibe. Support: support embibe. General: info embibe. What is its focal length? Question 3 Name a mirror that can give an erect and enlarged image of an object. Answer: Concave mirror. Question 4 Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Answer: We prefer a convex mirror as a rear-view mirror in vehicles because of two reasons :. Question 1 Find the focal length of a convex mirror whose radius of curvature is 32 cm. Question 2 A concave mirror produces three times magnified enlarged real image of an object placed at 10 cm in front of it.
Where is the image located? Solution: Because the image is real, so magnification m must be negative. Thus the image is located at a distance of 30 cm from the mirror on the object side of the mirror. Question 1 A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal?
Answer: The light-ray bends towards the normal because the ray of light goes from a rarer medium to a denser medium. Question 2 Light enters from air to glass having refractive index 1. What is the speed of light in the glass?
The speed of light in vacuum is 3 x 10 8 ms Question 3 Find out, from Table Also find the medium with lowest optical density. Answer: From table Question 4 You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table Question 5 The refractive index of diamond is 2.
What is the meaning of this statement? Answer: By saying that the refractive index of diamond is 2. Question 1 Define 1 dioptre of power of a lens. Answer: One dioptre is the power of a lens whose focal length is 1 metre.
Question 2 A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object?
Also, find the power of the lens. Question 3 Find the power of a concave lens of focal length 2 m. Question 1 Which one of the following materials cannot be used to make a lens? Question 2 The image formed by a concave mirror is observed to be virtual, erect and larger than the object.
Where should be the position of the object? Answer: d Between the pole of the mirror and its principal focus. Question 3 Where should an object be placed in front of a convex lens to get a real image of the size of the object? Answer: b At twice the focal length. Question 4 A spherical mirror and a thin spherical lens have each a focal length of cm.
The mirror and the lens are likely to be : a Both concave. Answer: a Both concave. Question 5 No matter how far you stand from mirror, your image appears erect. The mirror is likely to be a plane b concave c convex d either Ncert Solutions Class 10th Light Group plane or convex. Answer: d Either plane or convex. Question 6 Which of the following lenses would you prefer to use while reading small letters found in a dictionary? Answer: c A convex lens of focal length 5 cm.
Question 7 We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case. Answer: A concave mirror gives an erect image when the object is placed between the focus F and the pole P of the concave mirror, i.
The image thus formed will be virtual, erect and larger than the object. Question 8 Name the type of mirror used in the following situations. Support your answer with reason. Answer: a Concave mirrors are used as reflectors in headlights of cars. When a bulb is located at the focus of the concave mirror, the light rays after reflection from the mirror travel over a large distance as a parallel beam of high intensity.
Question 9 One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations. Answer: A convex lens forms complete image of an object, even if its one half is covered with black paper. It can be explained by considering following two cases. Case I : When the upper half of the lens is covered In this case, a ray of light coming from the object will be refracted by the lower half of the lens.
These rays meet at the other side of the lens to form the image of the given object, as shown in the following figure. Case II: When the lower half of the lens Is covered In this case, a ray of light coming from the object is refracted by the upper half of the lens.
These rays meet at the other side of the lens to form the image of the given object, as shown in the given figure. Question 10 An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed. The negative value of image height indicates that the image formed is inverted. The position, size, and nature of image are shown alongside in the ray diagram.
Question 11 A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. Question 12 An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. Thus, image is virtual, erect and diminished.
What does this mean? Question 14 An object 5. Find the position of the image, its nature and size. Question 15 An object of size 7. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image. The image is real, inverted and enlarged in size. Question 16 Find the focal length of a lens of power What type of lens is this?
Find the focal length of the lens. Is the prescribed lens diverging or converging? Reflection of light by curved surfaces; Images formed by spherical mirrors, center of curvature, principal axis, principal focus, focal length, mirror formula Derivation not required , magnification. Refraction; laws of refraction, refractive index. Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula Derivation not required ; Magnification.
Power of a lens;. Formulae Handbook for Class 10 Maths and Science. Question 1. Define the principal focus of a concave mirror? Answer: Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror. Question 2. The radius of curvature of a spherical mirror is 20 cm.
Question 3. Name the mirror that can give an erect and enlarged image of an object. Answer: When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged. Question 4. Why do we prefer a convex mirror as a rear-view mirror in vehicles? Answer: Convex mirrors give a virtual, erect, and diminished image of the objects placed in front of them. They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind him.
Find the focal length of a convex mirror whose radius of curvature is 32 cm. A concave mirror produces three times magnified enlarged real image of object placed at 10 cm in front of it. A ray of light travelling in air enters obliquely into water. Answer: The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal. Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal.
Light enters from air to glass having refractive index 1. Answer: Refractive index of a medium nm is given by,. Find out, from Table, the medium having highest optical density. A medium which has the highest refractive index will have the highest optical density and vice-versa. It can be observed from table Therefore, diamond has the highest optical density and air has the lowest optical density. You are given kerosene, turpentine and water.
Answer: The light can travel fast through water. Question 5. The refractive index of diamond is 2. This suggests that the speed of light in diamond will reduce by a factor 2. Define one dioptre of power of a lens? Answer: One dioptre is the power Of a lens Of focal length 1m. Power of lens is defined as the reciprocal of its focal length.
It is denoted by D. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image is equal to the size of the object?
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