Chapter 5: Light
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5.1 Reflection of Light
1. What is Spherical Mirror? What are the types of spherical mirrors?
2. Define including convex mirror and concave mirror diagram?
3. Define the following with a picture: - a) pole b) principal axis c) center of curvature d) radius of curvature
4. What is the relationship between focus distance and curvature radius?
5. What is the second focus of a spherical mirror?
6. Display in the table the state and nature of the image formed for the following states of the object
a. object is placed at infinity
b. The object lies between infinity and the center of curvature
c. Object is placed at the center of curvature
d. The object curvature is placed between the center and the focus.
e. Object is placed on the focus
f. Object placed between focus and pole
7. Display by image the image formed for the following states of the object: -
a) The object is placed at infinity
b) The object lies between infinity and the center of curvature
c) The object is placed at the center of curvature
d) Object curvature is placed between center and focus ..
e) The object is placed on the focus
f) The object is placed between the focus and the pole
8. Write three uses of convex mirrors.
9. Write three uses of the concave mirror.
10. If a spherical mirror is immersed in water, what will be the difference in its focus distance?
11. If you are given three mirrors - one plane, one convex, and one concave. How to identify them without touching
12. Which mirrors are used in the headlight of the car and why?
13. Write a comment - medical mirror
14. Using the diagram, establish the relationship between the radius of curvature and the focus distance.
15. Write the difference between regular and diffuse reflection?
16. If someone is running towards a plane mirror with a velocity of x centimeters per second, then at what velocity will his reflection run?
17. Why is the cinema curtain white and rough?
18. Ground glass is opaque, but the skin becomes transparent on wetting. Why?
19. Write the difference between normal reflection and absolute internal reflection?
20. What do you understand by lateral displacement? Explain by Picture? What does it depend on?
5.2 Refraction of light
21. What is refraction of light?
22. Write the rules for refraction of light.
23. Write and explain Snell's rule.
24. What do you understand by the optical density of a medium? How is it related to density.?
25. What do you understand by the refractive index of the medium?
26. Demonstrate refraction in light in the following stages through the picture:
(i) Intense to sparse media
(ii) rare to dense medium
27. Why does a glass rod immersed in glycerin become invisible?
28. Show refraction of prisms by drawing diagrams.
29. Prove by diagram - there is no deviation after rectangular glass slab refraction.
30. Show by the diagram that after refraction in the glass block, the incident ray and refractive ray remain parallel to each other.
31. What do you understand by refractor of prism and angle of refraction?
32. When a ray of light falls vertically on a surface separating the two mediums, Snell's law cannot be put into practice. Why?
33. When the beam of light is refracted by the prism, prove - the angle of deviation = i1 + i2 - A.
34. Why does a diamond shine?
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5.3 Lenses
35. What is a lens
36. Write how many types of lenses are there?
37. Write the definition of the following (I) Center of lens curvature
(II) the main axis of the lens
(III) the optical center of the lens
(IV) navel or focus of the lens
(V) nucleus plane of the lens
(VI) nucleus distance of the lens
38. What do you understand by real and virtual reflection?
39. What do you understand by the linear magnification of the image?
40. Why convex mirror is called a divergent and concave mirror as a convergent lens?
41. Explain the first prime focus and the second prime focus of the convex lens with a picture.
42. A candle is placed very close to the Convex lens, whose focus distance is F. If the candle is removed slowly, what will be the shape and nature of the reflection state in the following stages?
(I) less than F
(II) Focus
(III) More than F but less than 2F
(IV) at 2F
(V) away from 2 F
(VI) far away from them
43. Why is the Convex lens called magnifying glass? Write some uses of magnification glass?
44. How do we know whether a given lens is a convex lens or a concave lens?
45. Focal length of lace depends on what?
46. If a part of a Convex lens is covered with black paper, what will be the difference in its reflection?
47. Why is the human eye compared to a camera?
48. What do you understand by accommodation and adaptation of the human eye?
49. What do you understand by Thin Lens? Explain its point of light with a picture?
50. What are the characteristics of an image taken by a camera?
5.4 Human Eye
51. What do you understand by far point and near the point of the human eye? What is the value of this?
52. What do you understand by far-sightedness or hypermetropia? Through which lens is it possible to treat? Explain by the diagram.
53. What do you understand by myopia or myopia? Through which lens is it possible to treat? Explain by picture
5.5 Dispersion of light
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What do you understand
by visible light? |
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What do you understand by the Dispersion of light? how it differs from the scattering of light? |
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What is spectrum?
what is the cause of its origin? |
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What do you understand by monochromatic and polychromatic light? |
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Why red flowers look
red in colour in white light? |
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Why red flower look
black in blue light? |
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Why Sky looks blue? |
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Write two uses and two the adverse effects of UV rays, X-rays, and gamma rays? |
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What is the relation of the intensity of scattered light with its wavelength? |
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What is the role of different colors of light To form the color o of an Opaque body? write
down with examples? |
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What is the role of different colors of light in the color of a transparent body? write down
with example? |
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Moon has no atmosphere,
What can you determine logically about the colour of the sky of the Moon? |
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why is red light used
as a danger signal? |
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Why yellow light is used
as fog light in a vehicle? |
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Differentiate between
pure spectrum and impure spectrum? |
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What is Newton's color disc experiment? what does it tablet? |
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Why sun look reddish
during sunset and sun sign? |
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Why stars twinkle but
not planets? |
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why an object is not visible when it is kept very close to Eyes? |
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