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A concave mirror of focal length f(1) is...

A concave mirror of focal length `f_(1)` is placed at a distance of d from a convex lens of focal length `f_(2)`. A beam of light coming from infinity and falling on this convex lens- concave mirror combination retuens to infinity. The distance d must equal

A

`2f_(1) + f_(2)`

B

`-2f_(1) + f_(2)`

C

`f_(1) + f_(2)`

D

`-f_(1) + f_(2)`

Text Solution

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The correct Answer is:
A
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