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Q.

The distance between a convex lens and a plane mirror is 10cm. The parallel rays incident on the convex lens after reflection from the mirror form image at the optical centre of the lens. Focal length of lens will be ______cm.

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answer is 20.

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Detailed Solution

From the figure, using property of plane mirror

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Image distance = Object distance; 

f−10=10⇒f=20cm

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The distance between a convex lens and a plane mirror is 10cm. The parallel rays incident on the convex lens after reflection from the mirror form image at the optical centre of the lens. Focal length of lens will be ______cm.