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ICSE Class 10 Answered

Q. 4
question image
Asked by Rayeesa | 25 Apr, 2018, 09:57: PM
answered-by-expert Expert Answer
Let u be the object-to-lens distance and v be the image-to-lens distance
 
magnification = -3 ( real image formed behind the lens)
 
hence (v/u) = -3 or v = -3u
 
lens formula: (1/v)-(1/u) = 1/f ; -(1/3u)-(1/u) = 1/12 ; solving for u, we get u = 16 cm = 0.16 m
Answered by Thiyagarajan K | 26 Apr, 2018, 05:03: PM
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