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Two plane mirrors, a source S of light, emitting wavelengths of` lambda_(1) = 4000overset(@)A" and" lambda_(2) = 5600overset(@)A`and a screen are arranged as shown in figure. The angle `theta` shown is 0.05 radian and distance a and b are 1 cm and 38 cm respectively.
(a) Find the fringe width of interference pattern formed on screen by the blue light.
(b) Calculate the distance of first black line from central bright fringe.
(c) Find the distance between two black lines which are nearest to the central bright fringe.

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The correct Answer is:
(a)`80mu"m"` (b)280`mu"m"`(`c)560mu"m"`
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