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  4. A graph is plotted between angle of deviation (d) and angle of incidence (i) for a prism. The nearly correct graph is

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Q. A graph is plotted between angle of deviation $(d)$ and angle of incidence $(i)$ for a prism. The nearly correct graph is

Ray Optics and Optical Instruments

Solution:

For a prism, as the angle of incidence increases, the angle of deviation first decreases, goes to a minimum value and then increases.