CBSE 2025 · Region 5 · Set 3 · Q25 · 3 marks
A right-angled prism ABC (refractive index $\displaystyle \sqrt{2}$ ) is kept on a plane mirror as shown in the figure. A ray of light is incident normally on the face AC.
(a)Trace the path of the ray as it passes through the prism.(b)Find the angle of deviation produced by the prism.
A right-angled prism ABC (refractive index $\displaystyle \sqrt{2}$ ) is kept on a plane mirror as shown in the figure. A ray of light is incident normally on the face AC.
(a)
Trace the path of the ray as it passes through the prism.
(b)
Find the angle of deviation produced by the prism.
Marking-scheme solution
(a)
$\displaystyle \sin i_{c}=\frac{1}{\sqrt{2}}$
$\displaystyle i_{c}=45^{\circ}$
(b)
The angle of deviation is $\displaystyle 180^{\circ}$ from the diagram.
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.