Question

Assertion: The focal length of the convex mirror will increase if the mirror is placed in water.

Reason: The focal length of a convex mirror of radius R is equal to `R/2`.

Options

• Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

• Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.

• Assertion is true and Reason is false.

• Assertion is false and Reason is true.

Answer 1

Assertion is false and Reason is true.

Explanation:

The focal length of a convex mirror, which is always half its radius of curvature, is a fixed geometric property of the mirror itself. Placing the mirror in water does not change its physical shape or radius and thus does not alter its focal length.