An object is placed in front of two convex lenses one by one at a distance u from the lens.Tge focal length of the lenses are 30cm and 15cm respectively .If the size of the image formed in the two is the same then u is?(answer given is 20 cm)

An object is placed in front of two convex lenses one by one at a dist

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An object is placed in front of two convex lenses one by one at a distance u from the lens.Tge focal length of the lenses are 30cm and 15cm respectively .If the size of the image formed in the two is the same then u is?(answer given is 20 cm)

An object is placed in front of two convex lenses one by one at a distance u from the lens.Tge focal length of the lenses are 30cm and 15cm respectively .If the size of the image formed in the two is the same then u is?(answer given is 20 cm)

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