JEE PYQ: Experimental Physics Question 27
Question 27 - 2019 (11 Jan 2019 Shift 1)
Which of the following graphs is the correct one, if $D_m$ is the angle of minimum deviation? (Given: refractive index $\mu$ decreases with increasing wavelength $\lambda$)
(1) $D_m$ decreasing with $\lambda$ (hyperbolic curve)
(2) $D_m$ increasing then decreasing with $\lambda$
(3) $D_m$ increasing with $\lambda$
(4) $D_m$ increasing with $\lambda$ (monotonic curve)
Show Answer
Answer: (1)
Solution
For small angle of prism, $D_m = (\mu - 1)A$. As wavelength increases, $\mu$ decreases, so $D_m$ decreases.
BETA
