9. The speed of light is maximum in:
(a) Glass
(b) Water
(c) Air
(d) Vacuum
Answer: (d) Vacuum
10. The magnification produced by a plane mirror is:
(a) +1
(b) -1
(c) 0
(d) Infinity
Answer: (a) +1
11. Which mirror is used in solar furnaces?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) None of these
Answer: (b) Concave mirror
12. The focal length of a concave lens is always:
(a) Positive
(b) Negative
(c) Zero
(d) Infinite
Answer: (b) Negative
13. The image formed by a convex lens when the object is placed between F and 2F is:
(a) Real and inverted
(b) Virtual and erect
(c) Highly diminished
(d) Laterally inverted
Answer: (a) Real and inverted
14. The phenomenon of light bending around obstacles is called:
(a) Refraction
(b) Reflection
(c) Diffraction
(d) Dispersion
Answer: (c) Diffraction
Class 10 Science Light – Reflection and Refraction True or False
1. Light travels faster in water than in air. Answer: False
2. A convex mirror always forms a virtual image. Answer: True
3. The focal length of a concave mirror is negative. Answer: False
4. Refractive index has no unit. Answer: True
5. A concave lens is a diverging lens. Answer: True
6. The image formed by a plane mirror is always real. Answer: False
7. The principal focus of a convex mirror lies behind the mirror. Answer: True
8. Snell’s law relates the angle of incidence to the angle of reflection. Answer: False
9. The magnification of a concave mirror can be greater than 1. Answer: True
10. A convex lens can form both real and virtual images. Answer: True
11. The power of a convex lens is negative. Answer: False
12. A concave mirror is used in torches and headlights. Answer: True
13. Light bends towards the normal when it passes from air to glass. Answer: True
14. The focal length of a lens depends on the material of the lens. Answer: True
15. A virtual image cannot be obtained on a screen. Answer: True
