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Q. No.A Laser light of wavelength \(660~\text{nm}\) is used to weld Retina detachment. If a Laser pulse of width \(60~\text{ms}\) and power \(0.5~\text{kW}\) is used the approximate number of photons in the pulse are:
[Take Planck's constant \({h}=6.62\times10^{-34}~\text{Js}]\)
1. \(10^{19}\)
2. \(10^{22}\)
3. \(10^{18}\)
4. \(10^{20}\)
[Take Planck's constant \({h}=6.62\times10^{-34}~\text{Js}]\)
1. \(10^{19}\)
2. \(10^{22}\)
3. \(10^{18}\)
4. \(10^{20}\)
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