Assertion :A laser beam of $0.2 W$ power can drill holes through a metal sheet, whereas a $1000 W$ torch-light cannot. Reason: The frequency of laser light is much higher than that of torch light.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
A laser is a highly monochromatic and near perfect 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 $0.2 W$ . But even a torch-light of $1000 W$ power cannot drill holes in such a metal sheet, because the light is less intense and the beam is not parallel.
Therefore, assertion is correct but reason is incorrect.

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Assertion :A laser beam of 0.2 W power can drill holes through a metal sheet, whereas a 1000 W torch-light cannot. Reason: The frequency of laser light is much higher than that of torch light.

Assertion :A laser beam of $0.2 W$ power can drill holes through a metal sheet, whereas a $1000 W$ torch-light cannot. Reason: The frequency of laser light is much higher than that of torch light.