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Engineering

[Diagram: Unpolarized light incident on a surface at 60 degrees, reflected ray is perpendicular to refracted ray, indicating complete polarization. Refraction angle is 30 degrees.] When unpolarized light is incident at an angle of 60° on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

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A metal wire of uniform mass density having length L and mass M is bent to form a semicircular arc and a particle of mass m is placed at the centre of the arc. The gravitational force on the particle by the wire is: [Diagram: Semicircular arc with mass m at center]

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