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The image is direct and is above principal axis an object is kept at a distance of 30 cm away from a lens. An image of same size is formed. What is the focal length of the lens? |
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Answer» Image of size is formed when the object is kept at 2F \(\therefore\) 2f = 30 cm \(\therefore\) f = 15 cm \(\therefore\) 30/2 = 15 cm |
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