An un-publicized beam of intensity $2 a^{2}$ passes through a thin Polaroid. Assuming zero absorption in the Polaroid the intensity of emergent planes polarized light is

2 a^{2}

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a^{2}

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\sqrt{2} a^{2}

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\frac{a^{2}}{2}

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Solution

The correct option is B $a^{2}$
When an upolarized beam passes through a polaroid, the intensity of the beam halves. When this polarized beam passes through a polaroid again, the beam's intensity varies by Malus' Law.
Thus the intensity becomes $\frac{2 a^{2}}{2} = a^{2}$

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An un-publicized beam of intensity 2a2 passes through a thin Polaroid. Assuming zero absorption in the Polaroid the intensity of emergent planes polarized light is

The correct option is B a2When an upolarized beam passes through a polaroid, the intensity of the beam halves. When this polarized beam passes through a polaroid again, the beam's intensity varies by Malus' Law. Thus the intensity becomes 2a22=a2

An un-publicized beam of intensity $2 a^{2}$ passes through a thin Polaroid. Assuming zero absorption in the Polaroid the intensity of emergent planes polarized light is

The correct option is B $a^{2}$
When an upolarized beam passes through a polaroid, the intensity of the beam halves. When this polarized beam passes through a polaroid again, the beam's intensity varies by Malus' Law.
Thus the intensity becomes $\frac{2 a^{2}}{2} = a^{2}$