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The path of a light ray, from air to three different media A, B and C for a given angle of incidence. Study the diagram, carefully and answer the following questions.

If a ray of light is incident in medium c, at an angle of $40 °,$ What will be its angle of refraction in air?

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45 °

40 °

60 °

None

answer is C.

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Detailed Solution

If a ray of light is incident in medium, at an angle of 40°, what will be its angle of refraction in air will be

60 °

From the given set of three pictures, the incident angle is

60 °,

and the angle of refractions are different for different media. If a ray is incident at

40 °,

the angle of refraction can be

60 °

since light follows its own path when reversed.

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