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BdPhO Regional (Dhaka-South) Higher Secondary 2019/1

Posted: Fri Apr 26, 2019 4:35 pm
by SINAN EXPERT
BdPhO Regional (Dhaka-South) Higher Secondary 2019(1).png
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A coherent beam of monochromatic light of wavelength $500$ $nm$ is directed towards two thin slits separated by a distance of $1$ $mm$. If the screen covers an angular region of $60˚$, as shown in the figure, approximately how many bright interference bands are visible on the screen?