(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

(i) A diverging lens of focal length 15 cm, forms an image at distance

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» Solution :(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.