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JEE Main202126 Aug 2021Morning ShiftPhysicsWave OpticsActual

White light is passed through a double slit and interference is observed on a screen 1 . 5   m away. The separation between the slits is 0 . 3   mm . The first violet and red fringes are formed 2 . 0   mm and 3 . 5   mm away from the central white fringes. The difference in wavelengths of red and violet light is in   nm .

Correct answer

300

Step-by-step solution

y 1 = λ r D d y 2 = λ v D d λ r − λ v = y 1 − y 2 d D = ( 3 .5 − 2 ) mm × 0 .3 mm 1 .5 m = 300 nm

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