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The plane faces of two identical plano-convex lens, each having a focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens at which an object must be placed to obtain a real, inverted image with magnification one is. |
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Answer» Two Plano-convex lenses of focal length f on combining give convex lens of focal length f/2 = 40/2 =20 cm obtain real image the object must be place at a 2F = 2 x 20 = 40. |
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