A plane mirror of length 30 cm is placed...

A plane mirror of length 30 cm is placed horizontally along with a vertical screen. A monochromatic point source of light is placed 20 cm to the left off the left edge of the mirror, at a height of 2 mm above the plane of the mirror. If the wavelength of light used is `6400Å`, then find the number of complete bright fringes formed.

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