A concave mirrorr of focal length f(1) i...

A concave mirrorr 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 mirrorr combination returns to infinity. The distance `d` must equal.

A

`f_1+f_2`

B

`-f_1+f_2`

C

`2f_1+f_2`

D

`-2f_1+f_2`

Text Solution

Verified by Experts

The correct Answer is:

A

Since final rays are parallel to principal axis i.e., image by lens if formed of concave mirror
`d=f_1+f_2`

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