A certain thin lens is made of glass with refraction index ?lens=1.500. In air, where the...
A certain thin lens is made of glass with refraction index ?lens=1.500. In air, where the index of refraction is 1.000, the lens has focal length ?0=15.5 cm. What is the focal length ? of the lens when immersed in water, where the index of refraction is 1.330?
Homework Answers
When the lens is in air, focal length of lens is given by
where 
is refractive index of
glass relative to air. 
and 
are radii of curvature of lens.
When the lens is in water, focal length of lens is given by
where 
is refractive index
of glass relative to water. 
Dividing the above equations with one another,
Focal length of glass lens in water is 
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