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Question

Choose the incorrect statement out of the following.

A
If we cut two spherical mirrors from same sphere, they must have same radius of curvature.
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B
The direction of incident ray is chosen to be positive.
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C
A concave mirror with very large aperture is chosen to focus the incident beam of parallel rays at a point.
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D
The focal length of plane mirror is infinity.
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Solution

The correct option is C A concave mirror with very large aperture is chosen to focus the incident beam of parallel rays at a point.
In order to focus the incident beam concisely to a single point, the region of the incoming incident beam needs to be restricted. This can be achieved by using a concave mirror with very small aperture (AB) compared to its radius of curvature.

Why this question?

Caution: For spherical mirrors of large aperture, focus will not be a single point.

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