a biconvex lens made of glass of refractive index 1.5 has radius of curratre of both of its surfaces as 40cm calculate the power and focal length of the lens also find out the change in the focal length of the lens when it is submerged in water (the refractive index of water with respect to air; w_a n _1.33)
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(i) 2.5 dioptre.
(ii) 40 cm
Focal length in water = 156.47 cm
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