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)`

A concave mirrorr of focal length `f_(1)` is placed at a distance of `

1.	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)`
Answer» Correct Answer - C

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