Optics Answers

The focal length of a curved mirror is -------- the radius of the spherical surface.
twice
equal to
half
one-quater

hat type of mirror would you use to produce a magnified image of your face?
plane
concave
convex
diffuse

If rays of light parallel and close to the principal axis are incident on a --------- mirror, they converge to a point after reflection from the mirror
plane
convex
concave
diffuse

If a 4-m-tall child stands 2 m in front of a vertical plane mirror, the image of the child will be ------- m tall
1
2
3
4

If you stand 2 m in front of a plane mirror, how far from you is your image?
1 m
2 m
3 m
4 m

The law of reflection states that
light travels in a straight line
light must be reflected into our eyes to be seen
the angle of reflection is equal to the angle of incidence
light striking a rough surface is scattered in all directions

A camera obscura used by a potrait painter is located 6 m from a child who stands 1 m tall. How tall is her image if the back of the camera obscura is 2 m away?
1/3 m
1/2 m
1 m
3 m

The human eye employs a -------- lens to -------- images.
converging ...... real
converging ...... virtual
diverging ..... real
diverging ..... virtual

Light is a form of energy that -------
is transported from place to place due to the temperature gradient
requires material media for its propagation
stimulates the sensation of sight
cannot be difrracted

Which of the following is NOT correct?
light is a longitudinal wave
light is a tranverse wave
light is an electromagnetic wave
light can exhibit the phenomenon of polarisation