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Calculate the refractive index of the ma...

Calculate the refractive index of the material of the lens using the following data.

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Given,` R_(1) = 0.2m` and `R_(2) = 0.2m`
`f= ( D^(2) - S^(2))/( 4D)`
`f= ( D^(2) - S^(2))/( 4D) = ( 0.85^(2) - 0.206^(2))/(4 xx 0.85) = 0.2m`
`f = ( D^(2) - S^(2))/(4D) = (0.9^(2) - 0.3^(2))/(4 xx 0.9) = 0.2 m`
`f_(av) =0.2m`
`n = 1+ (1)/(f) (( R_(1)R_(2)))/((R_(1)+R_(2)))`
`n = 1+ ( 1)/( 0.2) ((0.2 xx 0.2))/((0.2+0.2))`
n = 0.5
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