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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Physics

Angle of Deviation

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

$60^{\circ}$

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$40^{\circ}$

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$80^{\circ}$

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$20^{\circ}$

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Solution

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

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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In Fig. 4.67, a ray of light PQ is incident normally on the face AB of an equilateral glass prism. Complete the ray diagram showing its emergence into air after passing through the prism. Take critical angle for glass = $42^{\circ}$ .

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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 D 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 D
$20^{\circ}$

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.
$∴ D = 40^{\circ} + 40^{\circ} - 60^{\circ} = 20^{\circ}$