NEET 2011 Physics question

A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens ?

(1)Virtual, upright, height = 1 cm
(2)Virtual, upright, height = 0.5 cm
(3)Real, inverted, height = 4 cmCorrect
(4)Real, inverted, height = 1 cm

Answer: (3)

Solution

The refractive index is not stated in the question as printed; the standard glass value is taken (the key is consistent with this). For a biconvex lens with cm and cm: , so cm. With $u =

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Question ID VK-090959