NEET Physics Mirrors Assertion Reason Question
Assertion (A): The focal length of a concave mirror is considered negative according to the Cartesian sign convention. | Reason (R): For a concave mirror, the reflected rays converge at a point on the principal axis.
Both A and R are true, and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false.
Correct Answer
Detailed Explanation
Both statements are true: A concave mirror's focal length is negative as per the Cartesian sign convention, but the reason for this is not the convergence of rays, rather it is due to the direction of measurement being opposite to the incident light.
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