Question

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Air bubbles shines inside water, why?
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Answer 1

Step-by-step explanation:

They shine because of total reflection like you said. The speed of light is faster inside the air bubble than in the water. Thus the light gets reflected away from the bubble around the outside, looking like a mirror. This is only along the outer circle in the direction you are looking.

Answer 2

Thy shine because of total reflection. The speed of light is faster inside the air bubble than in the water.