Figure shows a small, plane strip suspended from a fixed support through a string of length l. A continuous beam of monochromatic light is incident horizontally on the strip and is completely absorbed. The energy falling on the strip per unit time is W. (a) If the strip is deflected slightly from its equilibrium position in the plane of the figure,what will be the the time period of the resulting oscillations?

Dear Student,
                     Force due to light falling on mirror=rate of change of momentum=WcSo Tension in the string (T) =mg2+Wc2hence acceleration we can take as T/m=g2+Wmc2we have time period =2πla=2πlg2+Wmc2So time period =2πlg2+Wmc2

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