How do NCERT Solutions for Class 12 Physics Wave Optics help students to prepare for exams?

Rainbow is formed due to internal reflection and dispersion.

In hypermetropia image formed by eye lens is beyond retina and is focussed to retina by a convex lens.

Heat is path dependent so path function but internal energy does not depend on path chosen.

f = 15

$m=-\frac{v}{u}=+\frac{1}{2}$            

  $v=-\frac{u}{2}$           

$\frac{1}{v}+\frac{1}{u}=\frac{1}{f}$            

$\frac{2}{-u}+\frac{1}{u}=\frac{1}{f}$            

u = – f = – 15cm

$\frac{1}{20}=\left(1.5-1\right)\left(\frac{2}{R}\right)$

R = 20cm

$\frac{1}{f\text{'}}=\left(\frac{1.5}{1.6}-1\right)\left(\frac{2}{R}\right)$            

$=\frac{-1}{16}\times \frac{2}{20}$                  

f' = – 160cm