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

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is C.

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Detailed Solution

A converging lens can concentrate a laser's extremely monochromatic, nearly-perfect parallel beam of light into a relatively small point. Even at a power of 0.2 W, the beam's excessive intensity allows it to pierce metal sheets. Yet, because to the light's lower intensity and non-parallel beam, even a torch with 1000 W of power cannot pierce such a metal sheet.

(A) is true but (R) is false.

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