302CHAPTER 23 23.63. (a) The lens maker’s equation for a lens made of material with refractive index and immersed in a medium having refractive index is 11.55n=2n122121.5511111nnRRn−=−−=−21fnThus, when the lens is in air, we have 11.551.00111.00airfR−R(1) and when it is immersed in water, 11.551.3311.33water−=1R−(2) Dividing Equation (1) by Equation (2) gives 1.331.551.000.551.331.001.551.330.22waterairff− == − 79.0 cmairf=()If , the focal length when immersed in water is
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