a. The refractive indices of diamond, glass and water at 20° C are 2.42, 1.52 and 1.33, respectively. In which medium, the speed of light will be the
i. highest?
ii. lowest?
b. A combination of a convex lens and a concave lens has a power of + 2 D. If the focal length of the
convex lens is 25 cm, what will be the focal length of the concave lens used in this combination?
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