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  4. 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

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Q. 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 sufferPhysics Question Image

Ray Optics and Optical Instruments

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.