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Cutting of Thin Lenses

A thin convex...

Question

A thin convex lens of focal length 30 cm placed in front of a plane mirror. An object is placed at a distance x from the lens (not in between lens and mirror) so that its final image coincides with itself. then, the value of x is

A

15 cm

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B

30 cm

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C

45cm

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D

Insufficient data

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Solution

The correct option is C 30 cm
Ray should of all noamally on
plane mirros. This will happen
if grays become parallel to
poincipal axis agter paesing
through Lens. SO of $O L = F = 30 c m$
hence option B is cosrect.

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