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Q.

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

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a

No refraction

b

Only dispersion

c

Only deviation

d

Both deviation and dispersion

answer is D.

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Detailed Solution

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