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In the single slit diffraction pattern, the distance between the second and fifth dark fringes is...

In the single slit diffraction pattern, the distance between the second and fifth dark fringes is 1 cm and the distance between the slit and the screen is 200 cm. The wavelength of the light used is 600 nm
a) Find the width of the slit. (considering that theta is too small, it can be accepted that tan theta = sin theta)
b) Find theta click for the third dark fringe.
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