defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Physics Optics Interference

In Young's double slit experiment, using sodium light (λ = 5898 Å), 92 fringes are seen. If another colour (λ = 5461 Å) is used then find the number of fringes.

1
62 
2
99 
3
67
4
85
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