( Q.1 – Q.5 carry 1 MARK)
1. What is the range of wavelength of visible light?
2. Name the mirror that can give an erect and enlarged image of an
object.
3. List two points of differences between concave lens and convex
lens?
4. State the principle of reversibility of light.
5. What
is the focal length of a concave lens of power -2.0 D?
( Q.6 – Q.8 carry 2 MARK)
6. Light enters from air into diamond, which has a refractive index of
2.42. Calculate the speed of light in diamond. The speed of light in air is 3 x
108 m/s.
7. What
is total internal reflection? State the conditions necessary for total internal
reflection.
8. Draw ray diagrams to show the formation of image of an object by a
concave lens when the object is placed
i) At infinity ii) between infinity and optical centre of
the lens
( Q.9 – Q.11 carry 3 MARK)
9. Define the following regarding reflection of light from plane
mirror
i) Reflecting surface ii)
Normal iii) Regular reflection
10. An object 5 cm in length is
placed at the distance of 20 cm in front of a convex mirror
of radius of curvature 30 cm. Find the position, nature, and size of image.
11. An object 3.0cm high is placed
perpendicular to the principal axis of concave lens of
focal length 7.5cm. The image is formed at a distance of 5.0 cm from the lens.
Calculate (i) Distance at which object is placed.
(ii) Size and Nature of Image
