Optics Answers

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

What 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

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

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?

What effect does enlarging of the hole in a pinhole camera have on the image? The image gets
larger
smaller
shaper
fuzzier

The critical angle for total internal reflection at an air-water interface is approximately
48o
. In which of the following situations will total internal reflection occur?

how is linear polarized light converted into circular polarize light