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CBSE Class 10 Answered

what will be the magnification if the object is moved 0.5m closer to the lens?
Asked by shreesha.alek | 12 Oct, 2009, 07:16: PM
Expert Answer

given that P = 2.5 D

f = 1/ 2.5 = 0.4 m = 40 cm

m = 2

since m = v / u, v = 2 u

using lens formula

1/f = 1/v - 1/u

1/40 = 1/2u - 1/u

1/40 = -1/2u

u = - 20 cm = - 0.2 m

Note that this value of u (< 0.5 m )indicates that some value in the question is incorrect. Plz verify the correctness of the question. 

Answered by | 28 Oct, 2009, 11:16: PM
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