Physics

Problem

A beam of plane-polarised light of intensity

40\,\text{W}\,\text{m}^{-2}

is incident on an ideal analyser. The transmission axis of the analyser makes an angle of

60^{\circ}

with the plane of vibration of the incident light. The intensity of the light emerging from the analyser is a)

30\,\text{W}\,\text{m}^{-2}

5\,\text{W}\,\text{m}^{-2}

10\,\text{W}\,\text{m}^{-2}

20\,\text{W}\,\text{m}^{-2}