Light

Theangle of reflection is equal to the angle of incidence

• always

• sometimes

• under special circumstances

• never

The image formed by a plane mirror is

• real, at the surface of the mirror and enlarged

• real, at the surface of the mirror and the same size as the object

• Virtual, behind the mirror and enlarged

• Virtual, behind the mirror and the same size as the object

The least distance of distinct vision for a young adult with normal vision is about

• 25 m

• 2.5 cm

• 25 cm

• 2.5 m

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is

• Electroscope

• kaliedoscope

• Periscope

• Stethoscope

The number of images formed when of an object placed between two plane mirrors inclined at right angles to each other is

• two

• five

• one

• three

As the angle between two plane mirrors is decreases gradually, the number of images of an object placed between them

• increases gradually

• Decreases gradually

• First increases then decreases

• First decreases then increases

The change in the converging power of an eye lens is caused by the action of

• iris

• ciliary muscles

• optic nerve

• retina

The size of the pupil of the eye is adjusted by

• cornea

• ciliary muscle

• optic nerve

• iris

The defect of vision in which the eye lens of a person gets progressively cloudy resulting in blurred vision is called

• myopia

• night blindness

• cataract

• hypermetropia

Which of the following changes occur when you walk out of bright sunshine into poorly lit room?

• The pupil becomes larger

• The lens becomes thicker

• The ciliary muscle relaxes

• The pupil becomes smaller