Determine the focal length in air, f, of a biconvex lens with radii 20 cm and 30 cm and refractive index 1.5. What is the focal length when the lens is totally immersed in water (n=1.33)?
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For a biconvex lens, R1 is positive and R2 is negative. So, for the lens in air, we have: Show more…
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