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WBJEE 2021 Physics and Chemistry Solved Paper

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PHYSICS

CATEGORY - I (Q1 to Q30)

Carry 1 mark each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ¼ mark will be deducted.

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Question : 28

Total: 80

In Young's double slit experiment, light of wavelength lambda passes through the double-slit and forms interference fringes on a screen 1.2m away. If the difference between 3 rd order maximum and 3 rd order minimum is 0.18cm and the slits are 0.02cm apart, then λ is

1200 nm
450 nm
600 nm
300 nm

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