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ntA comcave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2 .A beam of liqht coming from infinity and falling on this convex lens mirror combination returns to infinity .The distance d be?n ntExplain in detail why does one of the two focal length get doubledn |
| Answer» ntA comcave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2 .A beam of liqht coming from infinity and falling on this convex lens mirror combination returns to infinity .The distance d be?n ntExplain in detail why does one of the two focal length get doubledn | |