Assertion : A laser beam of 0.2 ~W power can drill holes through a...

A laser is a highly monochromatic and nearperfect parallel beam of light, due to which the beam can be focussed by a converging lens to a very small spot. As the intensity of the beam is too high, it can drill holes through a metal sheet even if the power is $0.2 \mathrm{~W}$. But even a torch-light of $1000 \mathrm{~W}$ power cannot drill holes in such a metal sheet, because the light is less intense and the beam is not parallel.