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In a Young’s double slit experiment with slit separation 0.1 mm, one observes a bright fringe at angle 40 1 rad by using light of wavelength λ 1 . When the light of wavelength λ 2 is used a bright fringe is seen at the same angle in the same set up. Given that λ 1 and λ 2 are in visible range (380 nm to 740 nm), their values are -

1. 400 nm, 500 nm
2. 625 nm, 500 nm
3. 380 nm, 500 nm
4. 380 nm, 525 nm

Correct answer: 625 nm, 500 nm

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