JEE MAIN - Physics (2019 - 11th January Morning Slot - No. 15)

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
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 174 English Option 1
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 174 English Option 2
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 174 English Option 3
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 174 English Option 4

Explanation

Since Dm = ($$\mu $$ $$-$$ 1) A & on increasing the wavelength, $$\mu $$ decreases & hence Dm decreases.

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