Question

In a Young's double slit experiment with slit separation 0.1 mm, one observes a bright fringe at angle 1/40 rad by using light of wavelength λ₁ . When the light of wavelength λ₂ is used a bright fringe is seen at the same angle in the same set up. Given that λ₁ and λ₂ are in visible range (380 nm to 740 nm), their values are : 

(1) 380 nm, 525 nm 

(2) 625 nm, 500 nm 

(3) 380 nm, 500 nm 

(4) 400 nm, 500 nm

Answer 1

Correct option: (2) 625 nm, 500 nm

Explanation:

d = 0.1 mm 

θ is very small

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