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Question

In Young's double – slit experiment, the y – coordinates of central maxima and 10th maxima are 2cm and 5cm, respectively. When the YDSE apparatus is immersed in a liquid of refractive index 1.5, the corresponding y – coordinates will be


A

2 cm, 7.5 cm

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B

3 cm, 6 cm

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C

2 cm, 4 cm

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D

43cm,103 cm

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Solution

The correct option is C

2 cm, 4 cm


Fringe width, w λ . Therefore, λ and hence w will decrease 1.5 times when immersed in the liquid. The distance between central maxima and 10th maxima is 3 cm in vacuum. When immersed in the liquid, it will reduce to 2 cm position of central maxima will not change while 10th maxima will be obtained at y = 4 cm.


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