Light

If the angle between incident ray and reflected ray is 100 degree, then what is the angle of incidence?

• 100

• 50

• 0

• none of these

The human eye behaves like which of the following instruments?

• Optical instrument

• Mechanical instrument

• Binocular

• Periscope

For two parallel mirrors facing each other, the number of images formed are:

• 20

• 10

• 0

• infinite

When does dispersion take place?

• When light passes through a glass slab

• When light passes through air

• When light passes through a rarer medium

• When light passes through a prism

The defect of eyes in which the lens of the eyes becomes blurred is

• myopia

• hypermeteropia

• cataract

• presbyopia

A person 1 m in front of a plane mirror seems to be _______ m away from his image.

• 1

• 2

• 3

• none of these

The size of the pupil becomes ______ when you see in dim light.

• larger

• smaller

• same size

• none of these

Night birds have ______ cones than rods in their eyes

• less

• more

• same

Image formed by a plane mirror is

• virtual behind the mirror and enlarged

• virtual, behind the mirror and of the same size as the object

• real at the surface of mirror and enlarged

• real , behind the mirror and of same size as the object.

____________ is a light sensitive screen.