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प्रश्न
Calculate the focal length of a convex lens whose radii of curvature of two surfaces is 10 cm and 15 cm respectively and its refractive index is 1.5.
संक्षेप में उत्तर
संख्यात्मक
उत्तर
Given :
`f = ?` `R_1 =10 "cm"` `R_2 = 15 "cm"` `mu = 1.5`
`1/f = (mu - 1)(1/R_1 - 1/R_2)`
`1/f = (1.5 - 1)(1/10 - 1/15)`
`1/f = (0.5)(0.1 - 0.066)`
= `(0.5)(0.034)`
`1/f = 0.017``
`therefore f = 58.82 "cm"`
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