Q.

The phenomenon which causes mirage is –

A. Interference
B. Diffraction
C. Polarisation
D. Total internal reflection
Answer» D. Total internal reflection
Explanation: Mirage is caused by total internal reflection in deserts where due to heating of the earth, refractive index of air near the surface of earth becomes lesser than above it. A ray of light coming from a distant object gets refracted from a denser to a rarer medium.
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