When a white light ray falls on a prism, the ray at its first surface suffers:

no refraction

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only dispersion

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only deviation

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both deviation and dispersion

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Solution

The correct option is D
both deviation and dispersion

When a beam of white light reaches the side of a prism, it undergoes refraction at the boundary of two media - air and glass and it also gets separated into its constituent colours.
Hence, on falling on a prism, the ray of light suffers both deviation and dispersion at its first surface.

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Similar questions

When a white light ray falls on a prism, the ray at its first surface suffers :

(a) no refraction

(b) only dispersion

(d) both deviation and dispersion.

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