## Question

###### (II) Coherent light from a laser diode is emitted through a rectangular area $3.0\mu m\times1.5\mu m$ (horizontal-byvertical). If the laser light has a wavelength of 780 nm, determine the angle between the first diffraction minima ($a$) above and below the central maximum, ($b$) to the left and right of the central maximum.

(II) Coherent light from a laser diode is emitted through a rectangular area $3.0\mu m\times1.5\mu m$ (horizontal-byvertical). If the laser light has a wavelength of 780 nm, determine the angle between the first diffraction minima ($a$) above and below the central maximum, ($b$) to the left and right of the central maximum.

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