1. A group of stars arranged in a define pattern is called constellation.

    A group of stars arranged in a define pattern is called constellation.

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  2. When a ray of white light passes through a prism, it splits up into rays of constituent colours or wavelengths. This phenomenon is called the dispersion of light.

    When a ray of white light passes through a prism, it splits up into rays of constituent colours or wavelengths. This phenomenon is called the dispersion of light.

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