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What happens to focal length of a convex...

What happens to focal length of a convex lens when it is immersed in water ?

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From lens maker's formula
`(1)/(f) = (mu - 1)((1)/(R_(1)) - (1)/(R_(2)))`
`:. f prop (1)/((mu - 1))`
As `.^(w)mu_(g) lt .^(a)mu_(g)`
`:. f_(w) gt f_(a)`. i.e., focal length of lens will increase.
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