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  • Show with the help of ray diagrams that a right angled isosceles prism can produce a deviation of  <img alt="90^{\circ}" src="https://entrancecorner.oncodecogs.com/gif.latex?90%5E%7B%5Ccirc%7D

Show with the help of ray diagrams that a right angled isosceles prism can produce a deviation of  90^{\circ}
If the refractive index is greater than \sqrt{2}.

Option: 1


Option: 2


Option: 3


Option: 4

None of these.


Answers (1)

\mathrm{\mu>\sqrt{2}}
\mathrm{\frac{1}{\mu}<\frac{1}{\sqrt{2}} }
\mathrm{\Rightarrow \sin C<\sin 45^{\circ} }
\mathrm{ \Rightarrow C<45^{\circ}}

Hence a ray striking a glass-air surface from inside the prism will be reflected back if angle of incidence is not less than 45^{\circ}.

90^{\circ} Deviation is produced if the ray strikes on one of the sides normally as shown. Here, 1=45^{\circ}
and hence reflection takes place.

Posted by

Ramraj Saini

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