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As we dive deep into the subject we learn more and more about the parts that make the whole concept. The complexity is revealed. Often, students take it as a mugging subject, but it isn't so. It is important for students, especially those who see their careers in the Medical Profession, to learn and unfold the complexities attached with the subject. NTSE Guru helps the students to build upon the concepts and interest in the subject. Chapter 6 - Life Processes. Chapter 7 - Control and Coordination.
Chapter 8 - How Do Organisms Reproduce. Chapter 9 - Heredity and Evolution. Chapter 15 - Our Environment. Chapter 16 - Management of Natural Resources. Physics, being a relatively more conceptual and operational subject, students find it tough to understand and relate with examples. The NTSE Guru team gives you detailed solutions along with examples of all the questions in very crisp versions through which you can build a better understanding and command over the subject.
Chapter 10 - Light. Chapter 11 - Human Eye and Colourful World. Chapter 12 - Electricity. Chapter 13 - Magnetic Effects of Electric Current. And there you have it. Don't miss out any, for better results. You are here on this page means you are We will send a verification code to this number. We will never display your number to other users.
Login with OTP. Login with Password. For Subscription. For Academic Support. For Technical Support. General Queries: info ntseguru. Technical Support: support ntseguru. Feedback Support: feedback ntseguru. Good Luck!!! Download the App. Subscribe to Youtube Channel. Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life.
Formulae Handbook for Class 10 Maths and Science. Question 1. What is meant by power of accommodation of the eye?
Answer: The power Of accommodation of the eye is the ability of the eye to observe the distinct objects clearly which are situated at a large distance from the eye. The ciliary muscles are responsible to change the focal length Of the eye lens. The value of power of accommodation Of human eye is about 4D.
Question 2. A person with a myopic eye cannot see objects beyond 1. Answer: The far point for myopic eye is 1. Question 3. What is the far point and near point of the human eye with normal vision? Answer: For human eye with normal vision, far point is at infinity and near point is at 25 cm from the eye.
Question 4. A student has difficulty reading the blackboard while sitting in the last row. Answer: As the child has difficulty in reading the blackboard, he is suffering from myopia or short sightedness. To correct this defect, he has to use spectacles with concave lens of suitable focal length. Page � Question 1. The human eye can focus objects at different distances by adjusting the focal length of the eye lens.
This is due to a presbyopia b accommodation c near-sightedness d far-sightedness Answer: b Human eye can change the focal length of the eye lens to see the objects situated at various distances from the eye. This is possible due to the power of accommodation of the eye lens. The human eye forms the image of an object at its a cornea b iris c pupil d retina Answer: d The human eye forms the image of an object at its retina. The least distance of distinct vision for a young adult with normal vision is about a 25 m b 2.
It is 25 cm for a young adult with normal visions. The change in focal length of an eye lens is caused by the action of the a pupil b retina c ciliary muscles d iris Answer: c The relaxation or contraction of ciliary muscles changes the curvature of the eye lens.
The change in curvature of the eye lens changes the focal length of the eyes. Hence, the change in focal length of an eye lens is caused by the action of ciliary muscles. Question 5. A person needs a lens of power � 5. Question 6. The far point of a myopic person is 80 cm in front of the eye. Question 7. Make a diagram to show how hypermetropia is corrected. Assume that near point of the normal eye is 25 cm.
Question Why do stars twinkle? Answer: The stars twinkle at night, because the star light reaching Our eyes increases and decreases continuously due to atmospheric refraction. When star light reaching our eyes increases, the star looks bright and when the star light reaching our eyes decreases, it appears dim. Explain why the planets do not twinkle? Answer: Planets being close to earth appear larger in size.
A planet can be Considered as a collection of large number of small sized objects. Twinkling effect Of these objects cancel each other. Why does the sun appear reddish early in the morning? Answer: At sunrise, the sun looks almost reddish because only red colour which is least scattered is received by our eye and appears to come from sun. Hence the appearance Of sun at sunrise, near the horizon looks almost reddish. Why does the sky appear dark of blue to an astronaut?
Answer: At such huge heights due to absence of atmosphere, no scattering of the light takes place. Therefore sky appears dark. The human eye forms the image of an object at its [NCERT] a cornea b iris c pupil d retina Answer: d Retina is the light sensitive surface of eye on which the image is formed. The human eye can focus objects at different distances by adjusting the focal length of eye lens.
This is due to [NCERT] a presbyopia b accommodation c nearsightedness d farsightednes Answer: b Accommodation is the ability of eye lens to focus both near Class 10th Physics Chapter 1 Ncert Solutions Map and distant objects by adjusting its focal length. The change in focal length of eye lens is caused by action of [NCERT] a pupil b retina c ciliary muscles d iris Answer: c Ciliary muscles contract and extend in order to change the lens shape for focussing image ayretina. The least distance of distinct vision for a young adult with normal vision is about [NCERT] a 25 m b 2.
At noon the Sun appears white as [NCERT Exemplar] a light is least scattered b all the colours of the white light are scattered away c blue colour is scattered the most d red colour is scattered the most Answer: a At noon, the Sun appears white because the light from the Sun is directly over head and travel relatively shorter distance. The Sun appears white as only a little of the blue and violet colours are scattered.
A person cannot see distinctly objects kept beyond 2 m. Which of the following phenomena of light are involved in the formation of a rainbow? The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally and finally refract it again when it comes out of the raindrop.
Question 8. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky? Question 9. A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct? Answer: a The student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book because he is suffering from hypermetropia or far sightedness.
He can see distant objects clearly but cannot see nearby objects distinctly. In the following diagram, the path of a ray of light passing through a glass prism is shown below. Angle of emergence is the angle made by the emergent ray with the normal to the surface when it comes out from the prism after refraction, which is shown by angle Q.
Angle of deviation is the angle between the incident ray and the emergent ray, which is shown by angle P. Human Eye The organ which gives us the sense of light or enables us to see. It interprets the shapes, colours and dimensions of the. Parts of the Human Eye Retina: It is a light sensitive screen on which image is formed.
It contains rods sensitive to intensity of light and cones sensitive to colour. Cornea: Thin membrane acts like a lens which allow light to enter the eye. Sclera: Outer part of the eye, protects interior of the eye. Eye Lens: Convex lens made of transparent, crystalline and flexible jelly like material. Refractive index of eye lens is 1. Pupil: Hole in the middle of iris through which light enters. Iris: Controls the amount of light entering the eye by changing the size of pupil. Optical Nerve: Nerves take the image to the brain in the form of electrical signals.
Defects of Human Eye Myopia or Short Sightedness: can see nearby objects but cannot see far off objects distinctly.
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