Question

What should be the value of distance d so that final image is formed on the object itself. (focal lengths of the lenses are written on the lenses).

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A

10 cm

B

20 cm

C

5 cm

D

none of these

Medium
Solution
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Correct option is A)

By lens maker formula

note:- positive direction is direction of incident ray so all the values of u and v are taken accordingly with sign.

For convex lens :




For concave lens :

Image of convex lens will now behave object for concave lens




cm


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