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Q.

How will an air bubble behave when a ray of light is passed through it inside the water ?

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a

Concave

b

Convex

c

Diverging

d

Converging

answer is A.

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Detailed Solution

An air bubble behaves like a concave lens when a ray of light is passed through it inside the water .
Here, we can say that the air bubble acts like a Concave lens within the water. Concave lenses are called diverging lenses because the rays that fall on them diverge. The concave lens diverges a straight light beam from the source to make a diminished, upright virtual image, and so it generates both real and virtual images. As light strikes an air bubble with such a convex surface, it is reflected within the water, much like a concave lens. Also, the refractive index of air is

1

and the index of water is

1.33

. Thus, the refractive index of water is more than air. So, the concave lens is an air bubble inside the water.
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