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A concave mirror of focal length 6 cm is placed at a distance 'd' from the convex lens of focal length 8 cm. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance 'd' must be equal to: |
14 cm 20 cm 28 cm 22 cm |
20 cm |
The correct answer is Option (2) → 20 cm |
