Physics-

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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

- Greater deviation
- Same deviation
- No deviation
- Total internal reflection

## The correct answer is: Same deviation

### 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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