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A laser beam is operating at $100 \mathrm{~mW}$. The amount of energy stored by $90 \mathrm{~cm}$ length of this laser beam will be
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The correct answer is:
$3 \times 10^{-10} \mathrm{~J}$
Energy of LASER beam,
$=\frac{I l}{C}=\frac{100 \times 10^{-3} \times 90 \times 10^{-2}}{3 \times 10^8}=3 \times 10^{-10} \mathrm{~J}$
$=\frac{I l}{C}=\frac{100 \times 10^{-3} \times 90 \times 10^{-2}}{3 \times 10^8}=3 \times 10^{-10} \mathrm{~J}$
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