What is the radius of curvature of plane mirror?

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the focal length of plane mirrors is considered to be infinite, as the radius of curvature is infinite. However, imagine this scenario: You have a perfectly flat (no one get mad, this is theoretical)plane mirror, and the earth is perfectly flat as well(theoretical)
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the focal length ofplane mirrorsis considered to be infinite, as theradius of curvatureis infinite. However, imagine this scenario: You have a perfectly flat (no one get mad, this is theoretical)plane mirror, and the earth is perfectly flat as well(theoretical) read less
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Conceptual understanding is the key to success.

infinity
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It is infinity, since a plane is considered equivalent to a sphere of radius infinity.
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It is infinity, since a plane is considered equivalent to a sphere of radius infinity.
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Infinity
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