(a) Discuss the formation of Newton's rings by reflected light. Descr…

Question

(a) Discuss the formation of Newton's rings by reflected light. Describe the experimental arrangement and give necessary theory. Why are Newton's rings circular? (12)

(b) In a plane transmission grating the angle of diffraction for second order maxima is $30^\circ$. Calculate the number of lines in one centimetre of the grating surface. $\lambda = 5 \times 10^{-5} \text{ cm}$. (8)

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