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Question
What focal length can be assigned to a plane mirror?
What focal length can be assigned to a plane mirror?
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Solution
- A plane mirror can be known as a spherical mirror of infinite radius of curvature as the plane mirror is a straight mirror.
- Since the focal length is half of the radius of curvature, the focal length of a plane mirror is also infinity as the image can be formed at an infinite distance inside the mirror. Hence the focal length of infinity can be assigned to a plane mirror.
- A plane mirror can be known as a spherical mirror of infinite radius of curvature as the plane mirror is a straight mirror.
- Since the focal length is half of the radius of curvature, the focal length of a plane mirror is also infinity as the image can be formed at an infinite distance inside the mirror. Hence the focal length of infinity can be assigned to a plane mirror.
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