Unpolarized light of wavelength in air and intensity first passes through Polarizer A…

PHYSICS · Single correct · CBSE · Physics · Wave Optics · Wave Optics

Problem

Unpolarized light of wavelength 500 nm500\,\text{nm} in air and intensity I0I_0 first passes through Polarizer A whose transmission axis is vertical. The emerging light then passes through Polarizer B whose transmission axis makes an angle of 60∘60^{\circ} with the vertical. Immediately after leaving Polarizer B, the light enters water with refractive index 1.331.33. Which pair gives the wavelength λ\lambda of the light inside the water and its intensity II there, expressed in terms of the given quantities? (a) λ≈500 nm,  I≈0.13 I0\lambda\approx500\,\text{nm},\; I\approx0.13\,I_0 (b) λ≈375 nm,  I≈0.13 I0\lambda\approx375\,\text{nm},\; I\approx0.13\,I_0 (c) λ≈667 nm,  I≈0.13 I0\lambda\approx667\,\text{nm},\; I\approx0.13\,I_0 (d) λ≈375 nm,  I≈0.25 I0\lambda\approx375\,\text{nm},\; I\approx0.25\,I_0

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