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19. A plano convex lens of focal length 30 cm has its plane surface silvered. An object is placed at 40 cm from the lens on convex side. The distance of image from the lens is

Answer» 19. A plano convex lens of focal length 30 cm has its plane surface silvered. An object is placed at 40 cm from the lens on convex side. The distance of image from the lens is


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