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In the figure shown, a screen is placed ...

In the figure shown, a screen is placed normal to the line joining the two point coherent sources `S_1 and S_2`. The interference pattern consists of concentric circles.

(a)Find the radius of the nth bright ring.
(b) If d=0.5 mm, `lambda=5000 Å` and D=100 cm, find the radius of the closest second bright ring.
(c) Also, find the value of n for this ring.

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