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Suppose 10^-17 J of light energy is needed by the interior of human eye to see an object. The photons of green light ( $λ$ = 550 nm) needed to see the object are:

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answer is B.

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Detailed Solution

$E_{Needed} = 10^{- 17} = n \cdot \frac{hc}{λ}$
where n is no. of photons needed of energy $\frac{hc}{λ}$ provide energy of 10^-17 J.

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