What is the reason for shiny air bubble in the water?

A) Dispersion
B) Refraction
C) Diffraction
D) Total internal reflection

The right option is D.

The reason why the air bubble shines in water is because of the total internal reflection. The speed of light inside the air bubble is faster than in the water. The reason why the air bubble appears to be like a mirror is that the light gets reflected around the outside of the bubble.

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