Question

Assertion (A): Greater the focal length of a lens, less is its power.

Reason (R): Power of a lens is inversely proportional to its focal length.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Explanation:

The assertion is true because a lens with a greater focal length has less power. The reason is also true and explains this relationship: lens power is inversely proportional to focal length.