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प्रश्न
A biconvex lens made of glass (refractive index 1.5) has two spherical surfaces having radii 20 cm and 30 cm. Calculate its focal length.
उत्तर
`1/f = (mu - 1) (1/R_1 + 1/R_2)`
`1/f = (1.5 - 1) (1/30 + 1/20)`
f = 24 cm
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