Question

At minimum deviation position while determination of refractive index of prism we observe​

Answer 1

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Answer 2

Answer:

When the prism is kept in the minimum deviation position, the width of the spectral line is minimum, which is equal to the slit width. But when the prism is moved away from the minimum deviation position. the line width increases. Now the refractive index can be determined anywhere along the width of the line.