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Asked by sarveshvibrantacademy | 07 May, 2019, 11:38: AM
Expert Answer
mirror equation after applying sign convention for convex mirror :- ................(1)
by differentiating eqn.(1) with respect to time,
where u is the object-to-lens distance, v is image-to-lens distance, f is focal length, Vo is the object speed and Vi is image speed .
let us eliminate v using eqn.(1) : v = ( f u ) / (f+u) or ..................(3)
from (2) and (3), ...................(4)
In eqn.(4), multiplier term on RHS is always >1 irrespective of u < f or u > f .
Hence Vi < Vo irrespective of u < f or u > f . Hence case (A) and case (C) are true
It can be verified from eqn.(4) that case (B) and (D) are false
Answered by Thiyagarajan K | 09 May, 2019, 10:19: AM
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