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Unit - 5.4 Dispersion Of Light By A Prism — PHYSICS STD 8 — Question

ICSE BoardEnglish MediumSTD 8PHYSICSUnit - 5.4 Dispersion Of Light By A Prism2 Marks
Question
Why does the white light split on the first refracting face of prism ?
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Answer

When a white light ray falls on the first surface of a prism, light rays of different colours due to their different speeds in glass get refracted (or deviated) through different angles. Thus, the dispersion of white light into its constituent colours takes place at the first surface of prism.

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