Q15 of 123 Page 410

A thin lens is made with a material having refractive index μ = 1.5. Both the surfaces of the lens are convex. It is dipped in water (μ = 1.33). It will behave like

In this case, we can see, that, lenses refractive index is larger than of water. So, it will act as a regular converging lens.

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13

A symmetric double convex lens is cut in two equal parts by a plane containing the principal axis. If the power of the original lens was 4 D, the power of a divided lens will be

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Two concave lenses L1 and L2 are kept in contact with each other. If the space between the two lenses is filled with a material of smaller refractive index, the magnitude of the focal length of the combination

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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