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ICSE Class 9 Answered

when an object of height 1 cm is kept at a distance 4 cm from a concave mirror its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. find the focal length of mirror
Asked by vansh.harkut | 17 Feb, 2018, 23:18: PM
answered-by-expert Expert Answer
begin mathsize 12px style 1 over v plus 1 over u equals 1 over f end style
v = mirror to image distance = 6 cm
u = mirror to object distance = -4 cm
f is focal length
 
begin mathsize 12px style 1 over f equals 1 over 6 plus fraction numerator 1 over denominator negative 4 end fraction end style
solving for f, we get  f = -12 cm
 
hence focal lenght is 12 cm
Answered by Thiyagarajan K | 17 Feb, 2018, 23:58: PM

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