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ICSE Class 10 Answered

An object of height 20cm is kept at a distance of 48cm in front of a mirror of focal length 12cm.if the mirror is convex, find the distance of image from the mirror
question image
Asked by asha83.saurav | 08 Dec, 2018, 08:04: PM
answered-by-expert Expert Answer
Wehave mirror equation, begin mathsize 12px style 1 over v plus 1 over u equals 1 over f space........................ left parenthesis 1 right parenthesis end style
where v is image to mirror distance to be calculated
u is object to nirror distance = 48 cm ; f is focal length of convex mirroe = -12 cm ( as per sign convention)
 
hence we can calculate v from eqn.(1) :  begin mathsize 12px style 1 over v space equals space minus 1 over 12 plus 1 over 48 space equals space minus 1 over 16 end style or   v = -16 cm
Hence image is formed at a distance 16 cm from mirror on the back side of mirror.
Answered by Thiyagarajan K | 08 Dec, 2018, 09:28: PM

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