Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsTIR/Prism and DispersionMedium2 minQB

PhysicsMediumsingle choice

A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid?

Source diagram

Options:

Answer:

Solution:

$sin C = \frac{3}{4 ^{2} + 3 ^{2}} = \frac{3}{5}$

$sin C = \frac{1}{μ} = \frac{v}{c}$

$v = 3 \times 1 0^{8} \times \frac{3}{5}$

$v = 1.8 \times 1 0^{8} m/s$

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:TIR/Prism and Dispersion

⏱ 2mℹ️ Source: QB

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