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Question
A monochromatic beam of light passes from an optically denser medium into an optically rarer medium. As a result, ____.
A monochromatic beam of light passes from an optically denser medium into an optically rarer medium. As a result, ____.
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Solution
The correct option is A its velocity increases
The speed of light in a medium depends on the optical density of the medium. For a medium with higher optical density, the speed of light in the medium is lesser. Therefore, when a light ray enters an optically rarer medium from an optically denser medium, its speed increases. It may be however noted that the frequency of the ray does not change with a change in the medium.
its velocity increases
The speed of light in a medium depends on the optical density of the medium. For a medium with higher optical density, the speed of light in the medium is lesser. Therefore, when a light ray enters an optically rarer medium from an optically denser medium, its speed increases. It may be however noted that the frequency of the ray does not change with a change in the medium.
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