A person finds that the Sun's rays reflected by the still water of a lake are polarised. If the refractive index of water is 1.327, the Sun will be seen at an angle of with the horizon.

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(3) 37°. Given: μ=1.327 for the water, and the reflected sunlight is found to be completely polarised. Idea: complete polarisation on reflection happens at Brewster's angle, tan iₚ=μ, with iₚ measured from the normal -- and the normal to a still lake points straight up. iₚ=tan⁻¹1.327=53°. The incident ray therefore makes 53° with the vertical. The angle it makes with the horizontal is 90°-53°. So the Sun is seen 37° above the horizon.

A person finds that the Sun's rays reflected by the still water of a lake are polarised. If the refractive index of water is 1.327, the Sun will be seen at an angle of ______ with the horizon.

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