Question

Assertion: When tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the centre of the shadow of the obstacle. 

Reason : Destructive interference occurs at the centre of the shadow.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (c).

Explanation:

The waves diffracted from the edges of circular obstacle, placed in the path of light. interfere constructively at the centre of the shadow resulting in the formation of a bright spot.