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ICSE Class 10 Answered

Q. 5
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Asked by Rayeesa | 25 Apr, 2018, 09:59: PM
answered-by-expert Expert Answer
Let u be the object-to-lens distance, v be the image-to-lens distance and f is focal length of convex lens
 
given:- u+v = 100 cm; v = 75 cm;
 
hence u = 25 cm;
 
lens formula :- (1/v) - (1/u) = 1/f; as per sign convention v = +75 cm; u = -25 cm;
 
hence (1/75)+(1/25) = 1/f; we get focal length f = 18.75 cm
 
magnification = v/u = 75/(-25) = -3;
Answered by Thiyagarajan K | 26 Apr, 2018, 09:34: PM

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