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General
Easy
Question
A ray of light is incident normally on one face of 30° – 60° – 90° prism of refractive index 5/3 immersed in water of refractive index 4/3 as shown in figure
- The exit angle
of the ray is sin–1 (5/8) 30° 
P
- The exit angle of the ray is sin–1 (5/4
)
- Total internal reflection at point P ceases if the refractive index of water is increased to 5/2 by dissolving some substance
- Total internal reflection at point P ceases if the refractive index of water is increased to 5/6 by dissolving some substance
of the ray is sin–1 (5/8) 30° P
of the ray is sin–1 (5/4)
by dissolving some substance
The correct answer is: The exit angle of the ray is sin–1 (5/8) 30° P
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