A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.
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Ans. 1
Sol. λ B = 2λ A
Initially rate of decay A = λ A N 0
Initially rate of decay B = 2 λ A N 0
After one half life of A, rate of decay of A will become 
& that of B be 
After one half life of A on two half lives of B.
– 
= – 
⇒ n = 1
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