1.

The power in dioptre of an equi-convex lens with radii of curvature of 10cm and refractive index 1.6 isA. `+1.2`B. `+18`C. `+1.2`D. `+1.8`

Answer» Correct Answer - A
`1/f=P=(mu-1)(1/R_1-1/R_2)`
`=(1.6-1)(1/0.1-1/(-0.1))`
`=+12 D`


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