Question

Assertion: LASER is used to measure distant object as moon.

Reason : They are highly coherent source of light.

(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 (a).

Explanation:

As laser is highly monochromatic and highly coherent, we can send as a laser beam to the moon. from where it comes back reflected without much loss of intensity. That's why the large distance s can be measured accurately with the help of laser.