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  4. The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by

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Q. The graph between angle of deviation $(\delta)$ and angle of incidence (i) for a triangular prism is represented by

Ray Optics and Optical Instruments

Solution:

For the prism as the angle of incidence (i) increases, the angle of deviation ( $\delta$ ) first decreases goes to minimum value and then increases.