Question 10

A thin convex lens is made of two materials with refractive indices $$n_1 and n_2$$ as shown in figure. The radius of curvature of the left and right spherical surfaces are equal. f is the focal length of the lens when $$n_1 = n_2 = n.$$ The focal length is $$f + \triangle f$$ when $$n_1 = n$$ and $$n_2 = n + \triangle n$$. Assuming $$\triangle n \ll (n โ€” 1)$$ and 1 < n < 2, the correct statement(s) is/are


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