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. Name the mirror that can give an erect and enlarged image of an object. We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider field of view, which allows the driver to see most of the traffic behind.
Convex mirrors always form a virtual, erect, and diminished image of the objects placed class 10th ncert science book chapter 10 inst front of it. A concave mirror produces three times magnified enlarged real image of object placed at 10 cm in front of it. Where is the image located? A ray of light travelling in air enters obliquely into water.
Does the light ray bend towards the normal or away from the normal? The ray of light bends towards the normal. When a ray of light enters from an optically rarer medium having low refractive index to an optically denser medium having high refractive indexits speed slows down and it bends towards the normal.
Since water is optically denser than air, a ray of light entering from air into water will bend towards the normal. 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 Find out, from Table, the medium having highest optical density. Also find the medium with lowest 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. In which of these does the light travel fastest? Use the information given in Table. In water light travel faster as compare to kerosene and class 10th ncert science book chapter 10 inst because the refractive index of water is lower than that of kerosene and turpentine.
The speed of light is inversely proportional to the refractive index. The refractive index of diamond is 2. This means that the speed of light in diamond will reduce by a factor of 2.
The SI unit of power of lens is dioptre which is denoted by the letter 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 convex lens if the image is equal to the size of the object?
Also, find the power of the lens. It is class 10th ncert science book chapter 10 inst that the image of the needle is formed at a distance of 50 cm from the convex lens. Hence, the needle is placed in front of the lens at a distance of 50 cm. Which one of the following materials cannot be used to make a lens? 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? Where should an object be placed in front of a convex lens to get a real image of the size of the object? A spherical mirror and a thin spherical lens have each a focal length of cm.
No matter how far you stand from a mirror, your image appears erect. Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
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. Name the type of mirror used in the following situations. 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. The convex lens will form complete image of an object, even if its one half is covered with black class 10th ncert science book chapter 10 inst. It can be understood by the 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 above figure.
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. 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 class 10th ncert science book chapter 10 inst the nature of the image formed.
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. The negative value of u indicates that the object is placed 30 cm in front of the lens. This is shown in the following ray diagram. An object is placed at a distance of 10 cm from aconvex mirror of focal length 15 cm. Find the position and nature of the image.
The positive sign means image formed by a plane mirror is virtual and erect. Since the magnification is 1 it means that the size of the image is equal to the size of the object.
An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image. The positive value of image height indicates that the image formed is erect. Therefore, the image formed is virtual, erect, and smaller in size.
An object of size 7. At what distance from the mirror should a screen be placed, so that a sharp focused image can be class 10th ncert science book chapter 10 inst Find the size and the nature of the image.
Hence, it is a concave lens. Find the focal length of the lens. Is the prescribed lens diverging or converging? Hence, it is a convex lens or a converging lens.
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Properties of images formed by a plane mirrors: i The image formed by 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 following 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 refractive 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 one transparent medium to another is called refraction of light. The path of the ray of light in the first medium is called incident ray. The path of the ray of light in the second medium is called refracted ray. The angle between the incident ray and the normal at the surface of separation 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 between a concave and convex lens. Answer 2: Convex lens a 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 actually 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 a factor 2.
The S. Words and Expression � 2. A: There are 11 Chapters in English Class 10 book. The board decided to cut down the syllabus to reduce the course burden for students in the wake of the Coronavirus crisis. We hope this detailed article helps you.
If you have any queries regarding this article on CBSE Class 10 English Textbooks, ping us through the comment box below and we will get back to you as soon as possible. Support: support embibe. General: info embibe. Students can easily depend on them. NCERT books are compiled and written by experienced and notable authors who have a deeper understanding of topics.
A: There are 3 English books in Class Q: What is the name of English book of Class 10? Q: How many chapters are there in English Class 10? Download Here. Chapter 1- A Letter to God. Chapter 3- Two Stories about Flying. Chapter 4- From the Diary of Anne Frank. Chapter 5- The Hundred Dresses�I. Chapter 7- Glimpses of India.
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