A thin convex lens is made of two materials with refractive indices hi 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+ 
when n 1 = n and n 2 = n + 
n. Assuming 
n << (n - 1) and 1 < n < 2. The correct statement(s) is/are.
then 
n = 10' 3 and f = 20 cm, the value of | 
f| will be 0.02 cm (round off to 2 nd decimal place).
and 
remains unchanged if both the convex surfaces are replaced by concave surfaces of the same radius of curvature.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(b, c, d)
When n 1 = n 2 = n
…(i)
When, n 1 = n and n 2 = n + 
n
...(ii)
So from equation (i) and (ii)
So 
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