The amount of light entering the eye is controlled by

• eye-lens

• cornea

• Iris

• ciliary muscle

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

Cardboard surface

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

Marble floor with water spread over it

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

Mirror

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

Piece of paper

State the laws of reflection.

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incident lie in the same plane.

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

If you touch your _____ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with _____.

Fill in the blanks:

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

Night birds have ________ cones than rods in their eyes.