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Question

Complete the following sentences :
(a) If half part of a convex lens is covered, the focal length ............ change, but the intensity of image ...............
(b) A convex lens is placed in water. Its focal length will ...........
(c) The focal length of a then convex lens is .......... than that of a thick convex lens.


Solution

(a) If half part of a convex lens is covered, the focal length does not change, but the intensity of image decreases.
(b) A convex lens is placed in water. Its focal length will increase.
(c) The focal length of a thin convex lens is more than that of a thick convex lens.

Physics

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