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Using the following data calculate the r...

Using the following data calculate the refractive index of the material of the convex lens.
Radii of curvature of both the surface are 0.2m .
Data recorded in the shift method to determine the focal length of the convex lens are a follows `:`

Text Solution

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`f = (D^(2) -S^(2))/( 4D)`
`f = ( D^(2) - S^(2))/( 4D) = ( 0.82^(2) -0.128^(2))/( 4 xx 0.82) = 0.2m`
`f = ( D^(2) - S^(2))/( 4D ) = ( 0.9^(2) - 0.3^(2))/( 4 xx 0.9) = 0.2m`
`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 = 1.5
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