point a 5 cm tall object is placed perpendicular to the principal axis of a convex lens to focal length 20cm the distance of the object from the lens is 30 cm find the position or nature or size of the object forme
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It will be found to be equal to 6 cm. Thus, object is placed at a distance of 6 cm × 5 = 30 cm from the lens. A concave lens of focal length 15 cm forms an image 10 cm from the lens
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