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    Question

    Directions : Each of the following five items consists of a word in capital letters, followed by four words or groups of words. Select the word or group of words that is most similar in meaning to the word in capital letters.

    Which one of the following causes small air bubbles in

    water, which is stored in a glass vessel, to appear to shine with a silvery luster?
    A Total internal reflection Correct Answer Incorrect Answer
    B Reflection of light rays Correct Answer Incorrect Answer
    C Refraction of light rays Correct Answer Incorrect Answer
    D Polarization of light rays Correct Answer Incorrect Answer

    Solution

    The reason why the air bubble shines in water is because of the total internal reflection. • Total internal reflection is a phenomenon in which light travels back in the same medium or reflects back. It occurs when light travels from an optically denser to a rarer medium. • This happens in an air bubble in water when light travels from water to air and back out. This creates the shine or the silvery lustre. Hence option D is correct.

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