Q11 In projectors which lenses are used?
- Convex lens
- Concave lens
- Bipolar lens
- Both (a) and (b)
Q12 Due to which phenomena light rays emerging from a cinema machine spread wide on the screen?
- Dispersion
- Diffraction
- Scattering
- Refraction
Q13 Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?
- 50 m
- 2 m
- half of your height
- twice your height
Q14 The mirror used for the head light of a car is
- spherical concave
- plane
- cylindrical
- parabolic concave
Q15 The radius of curvature of a plane mirror
- is zero
- is infinity
- can be anywhere between zero and infinity
- None of the above
Q16 An object is placed at the focus of a concave mirror. The image will be
- real, inverted, same size at the focus
- real, upright, same size at the focus
- virtual, inverted, highly enlarged at infinity
- real, inverted, highly enlarged at infinity
Q17 What kind of image is created by a concave lens?
- real and smaller
- inverted and smaller
- inverted and larger
- upright and smaller
Q18 What type of mirror is used in a view finding mirror of a vehicle?
- Convex mirror
- Concave mirror
- Plane mirror
- Paraboloidal mirror
Q19 In mirrors, the back surface is coated with a thin layer of
- Mercury
- Silver
- red oxide
- silver nitrate
Q 20 A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a :
- converging lens
- diverging lens
- plano-converging lens
- plano-diverging lens