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A laser beam with a wavelength of 490 nm passes through a double-slits with a separation...

A laser beam with a wavelength of 490 nm passes through a double-slits with a separation of 0.04 mm and falls on a screen 60 cm behind the slits. (a) Find the positions of the 1 st and 2nd order bright fringes respected to the center on the screen. (b) Find the position of the 1 st -order dark fringe respected to the center on the screen.

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