Light Quiz

A light ray, which strikes any surface is known as?

• refracted ray

• reflected ray

• incident ray

• none of these

For a plane mirror, if the angle of reflection is 25°, what is the angle between the incident ray and reflected ray?

• 25°

• 50°

• 65°

• 90°

Sunlight is considered to contain how many different colours?

• 1

• 3

• 5

• 7

Inside the human eye, behind the cornea there is a fine, dark, muscular structure. What is the name of this structure?

• retina

• ciliary muscles

• iris

• pupil

What is the junction where the optic nerve and retina meet known as?

• blind spot

• yellow spot

• optic spot

• retinal spot

What is the type of reflection on the walls of a room?

• regular reflection

• irregular reflection

• refracted reflection

• none of these

What is the number of images formed for 2 plane mirrors inclined at angle of 40° with each other?

• 7

• 10

• 8

• 9

What instrument forms beautiful patterns using 3 plane mirrors inclined at angle of 60° with each other?

• periscope

• kaleidoscope

• microscope

• telescope

The image formed by a periscope is laterally inverted. True or False?

• True

• False

What is the persistence of vision of the human eye?

• 1/5th of a second

• 1/10th of a second

• 1/16th of a second

• 1/25th of a second