a convex lens of aperture 4 cm produces a real image of height 2cm when the object is placed in front of it when 25%of aperture of lens is covered by black paper the height of images of the same object the same distance will be
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Answer. 2. An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.
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ye photo dekhe or btay
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jaldi se btay smj aaya ki nahi
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