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QJEEM19Ph2e42: JEE Main 2019 Physics - Class 12 JEEM19Ph2e42 Solution: The variation of refractive index of a crown glass thin prism…

The variation of refractive index of a crown glass thin prism with wavelength of the incident light is shown. Which of the following graphs is the correct one, if Dm is the angle of minimum deviation?

JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 174 English

Multiple Choice Options

  • A https://ik.imagekit.io/novatra/photos/adb5530ed064e4626c5b0bded99e157a56b9d16d63c60cb25f01163d627e514e.webp
  • B https://ik.imagekit.io/novatra/photos/90f5e4bcdce0d09c76f1c119fdcb85eed4c70215ff966ca3631747e020554925.webp
  • C https://ik.imagekit.io/novatra/photos/47331581003b8e87d9b848f9e36319ce2330574660dad4eabd82beda3a112226.webp
  • D https://ik.imagekit.io/novatra/photos/26a5975a427249c608713ed3c8aa9abb7e3aa9c5bb3bea375a5cd3074bfe676d.webp

Step-by-Step Verified Solution

Since Dm = (μ − 1) A & on increasing the wavelength, μ decreases & hence Dm decreases.

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