Glasses, cameras, flashlights, binoculars, telescopes and peepholes are all made using __ lenses
a.) concave lenses
b.) convex lenses

Option (B) is true. convex lens

Explanation:

In all the devices as cameras, flashlights, binoculars, telescopes, pinholes, etc, we have to use convex lens, because in all such devices we have to concentrate the light at a point and which can be done by convex lens.

Convex lens converges the rays of light.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).