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Q.

The focal length of the plane mirror is _______________.

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a

Infinite

b

Zero

c

None of these

d

Negative

answer is A.

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Detailed Solution

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  • The focal length of a lens or mirror refers to the separation between its convex or concave surface and its focal point.
  • It is the location where two parallel light beams collide or merge.
  • The parallel beams that meet at infinity after reflection via a plane mirror indicate that the focal length of a plane mirror is infinite.
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