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ICSE Class 10 Answered

Q. 1
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Asked by Rayeesa | 25 Apr, 2018, 09:53: PM
answered-by-expert Expert Answer
magnification from image size = -6/3 = -2;
 
let v be the image-to-lens distance and u be object-to-lens distance
 
magnification = v/u = 30/u = -2; hence u = -15 cm
 
focal length : (1/f) = (1/v) - (1/u) = (1/30)+(1/15) = (1/10); hence focal length = 10 cm
Answered by Thiyagarajan K | 26 Apr, 2018, 02:35: PM

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