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Types of spherical lenses

ntA concave m...

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ntA concave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2. 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 ton ntA. f1+f2n ntB. -f1+f2n ntC. 2f1+f2n ntD. -2f1+f2n

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Q. A concave mirror of focal length

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