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We wish to obtain an equal sized inverted image of a candle flame on a screen kept at a distance of 4m from the candle flame.  (a) What should be the focal length of the lens? 
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Asked by sm1980agrawal | 23 Feb, 2020, 07:31: AM
answered-by-expert Expert Answer
(a) Type of lens :- Converging or convex lens
 
(b) If F is focal length, then candle (object ) is placed at a distance 2F from lens .
Image with magnification m = -1 is formed at other side of lens at a distance 2F from lens.
 
Hence 4F = 4 m ,  focal length of lense = 1 m , Candle is placed at a distance 2 m
 
Answered by Thiyagarajan K | 23 Feb, 2020, 08:53: AM

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