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A ray of light is incident at an angle of $60 \degree$ on one face of a prism of angle $30 \degree$ . The
emergent ray of light makes an angle of $30 \degree$ with incident ray. The angle made by
the emergent ray with second face of prism will be :

Option 1)
$0 \degree$

Option 2)
$90 \degree$

Option 3)
$45 \degree$

Option 4)
$30 \degree$

Answers (2)

best_answer

As we have learned

Angle of deviation through prism (δ) -

$\delta = i+e-A$

- wherein

$i=$ angle of incidence

$e=$ angle of emergence

$A=$ angle of prism

$i=60 \degree$

$A=30 \degree$

$\varrho =30 \degree$

$\varrho =i +e-A$ or $e=\varrho +A-i= 30+30-60=0 \degree$

so angle with face = $90 \degree$

Option 1)

$0 \degree$

This is incorrect

Option 2)

$90 \degree$

This is correct

Option 3)

$45 \degree$

This is incorrect

Option 4)

$30 \degree$

This is incorrect

Posted by

divya.saini

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