A bioconvex lens made of glass of refractive index 1.5 has radius of currature of both of its surfaces of 40 cm ,calculate the power and focal lengths of the lens also find out the change in the focal length of the lens when it is submerged in water with respect to air n=1.33.
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Explanation:
(i) 2.5 dioptre.
(ii) 40 cm
Focal length in water = 156.47 cm
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