Problem

A 1 W laser beam (of diameter 2 cm) falls normally on two circular holes each of diameter...

A 1 W laser beam (of diameter 2 cm) falls normally on two circular holes each of diameter 0.05 cm as shown in Fig. 1.13. Calculate the average number of photons that will be found between the planes AB and PP′. Assume λ = 6 × 10–5 cm and the distance between the planes AB and PP′ to be 30 cm.

[Ans. ≈ 4× 106 photons]

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