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The rays of different colours fail to converge at a point after going through a converging lens. This defect is called

If, light rays don’t converge after passing through a converging lens, it’s basically because of chromatic aberration. It happens as lens sometimes possess different refractive indices for different frequency of light.

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A convex lens is made of a material having refractive index 1.2. Both the surfaces of the lens are convex. If it is dipped into water (μ = 1.33), it will behave like

 17

A point object O is placed on the principal axis of a convex lens of focal length f= 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. An eye is placed 60 cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is

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If the light moving in a straight-line bends by a small but fixed angle, it may be a case of

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