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A small plane mirror is placed 21 cm in front of a concave mirror of focal length 21 cm. An object is placed 42 cm in front of the concave mirror.If light from the concave mirror strikes the plane mirror, where is the final image ?

A small plane mirror is placed 21 cm in front of a concave mirror of focal length 21 cm. An object is placed 42 cm in front of the concave mirror.If light from the concave mirror strikes the plane mirror, where is the final image ?

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