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ICSE Class 10 Answered

Q. 3
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Asked by Rayeesa | 25 Apr, 2018, 09:55: PM
answered-by-expert Expert Answer
Let v be the image-to-lens distance and u be the image-to-object distance;
magnification = v/u = 2 ; hence v = 2u ;
 
lens formula:- (1/v)-(1/u) = 1/f
 
hence (1/2u)-(1/u) = 1/25; solving for u, we get u = -12.5 cm
 
hence the object is to be placed at a distance 12.5 cm in front of the lens
Answered by Thiyagarajan K | 26 Apr, 2018, 02:52: PM

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