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A point object is placed at 30 cm from a convex glass lens n 2...

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A point object is placed at 30 cm from a convex glass lens n 2 of focal length 20 cm The fina image of object will be formed at infinity if A another concave lens of focal length 60 cm is placed in contact with the convex lens B another convex lens of focal length 60 cm is placed at 30 cm from the first lens 4 C the convex lens is immersed in a liquid of refractive index O 3 9 D The convex lens is immersed in a liquid of refractive index 8

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