A particle at a distance 10 cm from the pole of a concave mirror of focal length 30 cm is moving along principal axis towards mirror with constant velocity 10 cm/s.
(i) Distance between particle and its image at that moment is –
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Ans.
(i)
Sol. 
= 
⇒ 
= 
⇒ v = 15 ∴ u + v = 25 cm
(ii)
Sol. 
= 
= 1.5
v i/m = – m 2 v x/m
= – 2.25 × (10 
)
= 22.5 
v i/o = (–22.5) – (+10)
= – 32.5 cm/s
(iii)
Sol. a i/m = 
v i/m = 
(–m 2 v o/m )
= – v o/m 
= 
= 
= 22.5 cm/s 2 (Retardation)
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