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ICSE Class 10 Answered

A converging mirror forms a real image of height 4çm of an object of height 1cm placed 20cm away from the mirror find focal length and image distance
Asked by a7407259085 | 28 Nov, 2019, 11:00: AM
answered-by-expert Expert Answer
we have mirror equation, (1/v) + (1/u) = 1/f  .....................(1)
 
where v is mirror-to-image distance, u is mirror-to-object distance and f is focal length of mirror
 
magnification m = -v/u =  -v/(-20) = -4  or  v = -80 cm
 
hence focal lenth of mirror is obtained using eqn.(1),   (1/80)+(1/20) = 1/f  ; we get f = 16 cm
 
Hence focal length = 16 cm
 
image distance from mirror = 80 cm
Answered by Thiyagarajan K | 28 Nov, 2019, 11:42: AM

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