PLS REPLY WILL MARK YOU BRINLIST
Answers
Explanation:
Two marks questions :
22. State the laws of refraction of light.
23. Observe the following figure of refraction of light from the two
media of different optical density. Between ‘A’ and ‘B’ which has
greater optical density ? give reason for your answer.
24. Draw the ray diagram of image formation by a concave lens when an object is placed between
‘ ’ and ‘ ’ of the lens.
25. What is the nature, size and position of the image formed by a concave lens when an object is
place between infinity and optic centre of the lens.
III. Three or four marks questions :
26. Complete the following table with suitable answers for the image formation by a convex
slab.
V. Mathematical Problems :
29. A concave lens has a radius of curvature of . At what distance should the object from the
lens be placed so that it forms an image at form the lens ? Also find the magnification
produced by the lens. What is the nature of the image ?
30. A tall object is placed perpendicular to the principal axis of a convex lens of focal length
. The distance of the object from the lens is . Find the nature, position and size of
the image. Also find its magnification.
31. An object in length is held away from a converging lens of focal length .
what is the image distance ? Find the position, size, magnification and the nature of the image.
32. A concave lens of focal length forms an image at distance of from the lens. How far
is the object from the lens ? Find the magnification.
33. An object is placed at a distance of from a concave lens of radius of curvature . find
the position and nature of the image.
34. An object in length is placed at a distance of in front of a concave lens of focal length
. find the position, nature and size of the image.
35. An object of size is placed at in front of a convex lens of focal length . At what
distance from the lens should a screen be placed, so that a sharp focused image can be obtained ?
Find the size and nature of the image.
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Science Revision – 02 Date : 19.05.2021
LIGHT – REFRACTION
I. One mark questions :
1. What is refractive index of a material ?
2. If the velocity of light in vacuum is
and the refractive index of glass is 1.5. What is
the velocity of light in glass ?
3. The bottom of a swimming pool, appears to be raised for an observer outside the swimming
pool. Why ?
4. State Snell’s law of refraction of light.
5. What is the reason for refraction of light ?
6. State any two effects of refraction of light in our daily life.
7. If is incident ray of light, complete the diagram, showing the
refracted ray and emergent ray.
8. What is angle of incidence in refraction of light ?
9. Angle of refraction is more in diamond when compared to angle of refraction in glass. Why ?
10. A pencil partially immersed in water in an oblique manner appears to be bent at the surface.
Why ?
11. Light enters from air to glass having a refractive index 1.5. What is the speed of light in the
glass ? The speed of light in vacuum is
.
12. How is speed of light related to optical density ?
13. The refractive index of diamond is 2.42. What is the meaning of this statement ?
14. Write the lens formula in terms of .
15. What is the formula of magnification ?
16. Find the power of a convex lens of focal length .
17. What happens when a light ray is incident perpendicularly on a gals slab ?
18. How does a fish under clear water looks for an observer outside the water ?
19. Name the two types of lenses,
a) That converges the light rays b) That diverges the light rays
20. The magnification produced by a lens is . What does it mean ?
21. What is the type of the lens if its dioptre is ? What is its focal length ?An object is placed at a distance 10cm of from a concave lens of radius of curvature 30 cm . find
the position and nature of the image.
Explanation:
An object is placed at a distance 10cm of from a concave lens of radius of curvature 30 cm . find
the position and nature of the image.3. An object is placed at a distance of from a concave lens of radius of curvature . find
the position and nature of the image. An object is placed at a distance 10cm of from a concave lens of radius of curvature 30 cm . find
the position and nature of the image.3. An object is placed at a distance of from a concave lens of radius of curvature . find
the position and nature of the image. An object is placed at a distance 10cm of from a concave lens of radius of curvature 30 cm . find
the position and nature of the image.3. An object is placed at a distance of from a concave lens of radius of curvature . find
the position and nature of the image. An object is placed at a distance 10cm of from a concave lens of radius of curvature 30 cm . find
the position and nature of the image.3. An object is placed at a distance of from a concave lens of radius of curvature . find
the position