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The number of photons (lambda = 6630 Å) ...

The number of photons `(lambda = 6630 Å)` that strike per second on a totoally reflecting screen (as shown in figure), so that a force of `1N` is exerted on the screen, is approximentely).

A

a.`10^23`

B

b.`10^27`

C

c.`10^25`

D

d.`10^26`

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