Question

Assertion (A): When we enter a cinema hall from bright light, we cannot see properly for some time.​
Reason (R): Pupils contract in dim light.

• A. Both A and R are true, and R is the correct explanation of A
• B. A is false, while R is true​
• C. A is true, while R is false​
• D. Both A and R are true, but R is not the correct explanation of A

Answer 1

The correct option is C A is true, while R is false​

• When we enter a cinema hall from a bright light, we cannot see properly for some time because our pupils take some time to adjust.

• The main function of the pupils is to adjust according to the environment to allow light to enter the inner eye.

• When the surroundings are bright, the pupils contract to allow less light to enter and prevent damaging the eye from high intensity, and when the surroundings are dim, they expand to allow more light to see properly.

• However, this adjustment of pupils takes some time and this is the reason why we cannot see properly when we enter a dark room from bright light

Hence, the assertion is correct but the reason is incorrect.