1.

(i) A diverging lens of focal length 15 cm, forms an image at distance of 10 cm from the lens. How far is the object placed from the lens ? (ii) Under what condition a diverging lens when placed in a medium behaves as a converging lens

Answer» (i) f = -15 cm, v = -10 cm, u = ?
`1/u = 1/v - 1/f = - 1/10 - (1)/(-15) = (-1)/(30) " " therefore u = -30 cm`
(ii) Condition: when refracive index of medium gt refractive index of material of lens.


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