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A concave mirror of focal length ‘f1' is...

A concave mirror of focal length ‘`f_1`' is placed at a distance‘d’ from a convex lens length ‘`f_2`’. A beam of light coming from infinity and falling on this convex lens concave mirror combination returns to infinity. The distance ‘d’ must be.

A

`-f_1+f_2`

B

`2f_1+f_2`

C

`-2f_1+f_2`

D

`f_1+f_2`

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