1.

If the bio-convex lens is cut as shown in the figure, the new foacal length f' is

Answer»

`2f`
`f`
`f//2`
infinite

Solution :(a) `f=(mu-1)(1/(R_(1))-1/(R_(2)))`
`f=(mu-1)(1/R+1/R)`
`f=(mu-1)2/R` ……….(i)
and `f'=(mu-1)(1/R=1/(OO))`
`f'=((mu-1))/R`………..(ii)
From Eqs (i) and (ii) we GET
`f'=2f`


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