A ray of light falls on one face of an equilateral glass prism at 40- and emerges from the other face at the same angle- The deviation suffered by the ray is

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Deviation in Prism

A ray of ligh...

Question

A ray of light falls on one face of an equilateral glass prism at $40^{\circ}$ and emerges from the other face at the same angle. The deviation suffered by the ray is

$20^{\circ}$

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$80^{\circ}$

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$60^{\circ}$

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$40^{\circ}$

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Solution

The correct option is A
$20^{\circ}$

As $D = i + e - A$
where i is the angle of incidence, e is the angle of emergence, A is the angle of the equilateral prism.
$∴ D = 40^{\circ} + 40^{\circ} - 60^{\circ} = 20^{\circ}$

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A ray of light falls on one face of an equilateral glass prism at 40∘ and emerges from the other face at the same angle. The deviation suffered by the ray is

The correct option is A 20∘ As D=i+e−A where i is the angle of incidence, e is the angle of emergence, A is the angle of the equilateral prism. ∴ D=40∘+40∘−60∘=20∘

A ray of light falls on one face of an equilateral glass prism at $40^{\circ}$ and emerges from the other face at the same angle. The deviation suffered by the ray is

The correct option is A
$20^{\circ}$

As $D = i + e - A$
where i is the angle of incidence, e is the angle of emergence, A is the angle of the equilateral prism.
$∴ D = 40^{\circ} + 40^{\circ} - 60^{\circ} = 20^{\circ}$