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A ray of light falls normally on one sid...

A ray of light falls normally on one side other than the hypotenuse of a right angled isosceles prism of refractive index 1.5. From which side will the ray emerge from the prism? Find the deviation of the incident ray.

Text Solution

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ABC is a right angled isosceles triangle [Fig. 2.69].
Angle of prism `A = 90^(@)`
`therefore " " angleABC = angleACB = 45^(@)`
The ray of light is incident normally on the side AC and is incident on the side BC at an angle `45d^(@)` . As a result, after total internal reflection, the ray passes along QR perpendicular to the side AB.
Now, the angle of deviation =`angleSQR = delta = 90^(@)`
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