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Question

The focal length of a plane mirror is:

A
Zero
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B
Infinity
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C
Greater than zero
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D
Less than zero
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Solution

The correct option is B Infinity
A plane mirror can be thought of as a part of a very large spherical surface.
For a very large spherical surface, the radius of curvature tends to infinity.
R
We know that focal length,
f=R2
f

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