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Figure. Illustrates the interference exp...

Figure. Illustrates the interference experiment with Fresnel mirrors. The angle between the mirrors is `alpha = 12'` the distance from the mirrors intersection line to the narrow slit `S` and the screen `Sc` are equal to `r= 10.0 cm` and `b = 130 cm` respectively. the wavelength of light is `lambda = 0.55 mu m`. Find:
(a) the width of a fringe on the screen and the number of possible maxima,
(b) the shift of the interference pattern on the screen when the slit is displaced by `del l = 1.0 mm` along the arc of radius `r` with centre at the point `O`,
(c) at what maximum width `del_(max)` of the slit the interference fringes on the screen are still observed sufficiently sharp.

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