It is difficult to see through a closed glass window from the inside of a well lighted room,when it is dark outside.However,it becomes relatively easy to see outside,when the lights in the room are switched off.Explain.

Why does a person not able to see for some time when he comes out of a well lighted room at night or enters a dark room at day time?

Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

Suppose you are in a dark room . Can you see objects in the room ?Can you see objects outside the room ? Explain.

Light passing from air to glass is refracted ,as is light passing from glass to air. However, when you look out of a window at the view outside, the light does not seem to have been distorted. This is because

When you see in dim light the size of your pupil becomes:

These questions consist of two statements each,printed as Assertion and Reason.While answering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:A man is blind for some time when he comes out of a well lighted room to a dark place. Reason:iodopsin of cone cells is bleached in the presence of strong light.

Fill in the blanks : The size of the pupil become …………….when you see in dim light..

A ray of light passing through an equilateral traingular glass prism from air undergoes minimum deviation,when angle of incidence is 3//4 of the angle of prism.Clculate the speed of light in the prism.