A burning candle is placed in front of a concave spherical mirror on its principal axis at a distance of (4/3) f from the pole of the mirror (here f is the focal length of the mirror). The candle is arranged at right angles to the axis. The image of the candle in the concave mirror impinges upon a convex mirror of focal length 2f. The distance between the mirrors is 3f and their axis coincide. The image of the candle in the first mirror plays the part of a virtual object with respect to the second mirror and gives a real image arranged between the two mirror. T hen the total linear magnification of the system is (only magnitude )
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Ans. 6
Sol.
Ist reflection 
⇒ 
, v = – 4f
m 1 = – 
2 nd reflection 
v = –2f
m 2 = – 
= + 2
m 1 m 2 = – 3 × 2 = 6
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