The focal length of an equiconvex lens in air i equal to either of its radii of curvature. The refractive index of the material of the lens is …........

The focal length of an equiconvex lens in air i equal to either of its

1.	The focal length of an equiconvex lens in air i equal to either of its radii of curvature. The refractive index of the material of the lens is …........
Answer» `4/3` 1.5 2.5 0.8 Solution :TAKING `R_1=R,R_2=-R,f=R` Forconvex LENS, `1/f=(mu-1)(1/R_1-1/R_2)` `1/R=(mu-1)(2/R)` `THEREFORE 1=2mu-2` `therefore2mu=3` `thereforemu=3/2=1.5`

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The focal length of an equiconvex lens in air i equal to either of its radii of curvature. The refractive index of the material of the lens is …........

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