Statements on Concave Mirror – Rankers Physics

Reflection by Spherical Mirrors: Practice Problem & Solution

Given below are two statements: Statement-I: If a parallel paraxial beam of light were incident on a concave mirror, making some angle with the principal axis, the reflected rays would converge at a point in focal plane. Statement-II: Power(P) of concave mirror is positive even though focal length(f) is negative. In the light of the above statements, choose the most appropriate answer from the options given below.
Both statement I and statement II are correct
Both statement I and statement II are incorrect
Statement I is correct but statement II is incorrect
Statement I is incorrect but statement II is correct

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Reflection by Spherical Mirrors. Understanding the underlying formula is key to arriving at the correct answer below:

Statement I is a standard result of paraxial ray optics. For Statement II, power of a mirror is given by \(P = -1/f\). Since \(f\) is negative for a concave mirror, \(P\) is positive. Thus, both statements are correct.

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