First slide

Prism

Question

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and material are now added to P as shown in the figure. The ray will suffer

Moderate

A

Greater deviation
B

Same deviation
C

No deviation
D

Total internal reflection

Solution

As the prisms Q and R are of the same material and have identical shape they combine to form a slab with parallel faces. Such a slab does not cause any deviation.

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