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A double convex lens of `+ 5 D` is made of glass of refractive index `1.5` with both faces of equal radii of curvature. Find the value of curvature. |
Answer» `P = + 5D, mu = 1.5`, `R_(1) = R, R_(2) = -R` From `(1)/(f) = (mu - 1)((1)/(R_(1)) - (1)/(R_(2)))` `5 = (1.5 - 1)((1)/(R ) + (1)/(R )) = (1)/(R )` `R = (1)/(5)m = 20 cm` |
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