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ICSE Class 10 Answered

Q. 6
question image
Asked by Rayeesa | 25 Apr, 2018, 10:00: PM
answered-by-expert Expert Answer
Let object-to-lens distance u  = 15 cm (in front of lens)
Let object-to-lens distance v  = 60 cm (in front of lens)
let f be focal length in cm
 
lens formula:- (1/v) - (1/u) = (1/f)
as per sign convention :- v = -60 cm , u = -15 cm;
hence (-1/60+(1/15) = 1/f;             we get f = 20 cm ;
 
magnification : v/u = (-60)/(-15) = 4;
 
Nature of image :- virtual, erect, magnified
Answered by Thiyagarajan K | 26 Apr, 2018, 09:52: PM
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