An object is placed first at infinity and then at 20 cm from the object side focal plane of a convex lens the two images thus form are 5 CM apart the focal length of the lens is

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Arun · Answer

Dear Pranay For first case 1/f = 1/v - 1/infinity f = v For second case 1/f = 1/(f+5) - 1/-(f+20) On solving f = 10 cm Regards Arun (askIITians forum expert)

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An object is placed first at infinity and then at 20 cm from the object side focal plane of a convex lens the two images thus form are 5 CM apart the focal length of the lens is

An object is placed first at infinity and then at 20 cm from the object side focal plane of a convex lens the two images thus form are 5 CM apart the focal length of the lens is

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An object is placed first at infinity and then at 20 cm from the object side focal plane of a convex lens the two images thus form are 5 CM apart the focal length of the lens is

An object is placed first at infinity and then at 20 cm from the object side focal plane of a convex lens the two images thus form are 5 CM apart the focal length of the lens is

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