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In Young’s double-slit experiment, the two parallel slits are made one millimeter apart and a screen is placed one meter away. What is the fringe separation when blue-green light of wavelength 500 nm is used?(a) 0.5 mm(b) 50 mm(c) 0.25 mm(d) 25 mmI have been asked this question in a job interview.Question is from Wave Optics in section Wave Optics of Physics – Class 12

Answer»

Right OPTION is (a) 0.5 mm

Best EXPLANATION: Fringe width is given as:

β = \(\frac {D\lambda }{d}\).

So β = \(\frac { (1 \TIMES 500 \times 10^{-9} ) }{(10^{-3})}\)

β = 0.5 mm

Therefore, the fringe separation when blue-green light of wavelength 500 nm is used is 0.5 mm.


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