Question

Fill in the blank.
A ray of light is incident normally on one of the faces of a prism of apex angle ${30}^o$ and refractive index $\sqrt{2}.$ The angle of deviation of the ray is .......... degrees.

Answer 1

${\upsilon }_c={\sin }^{-1}\frac{1}{\mu }={\sin }^{-1}\frac{1}{\sqrt{2}}={45}^{\circ }\sqrt{2}=\frac{\sin e}{\sin {30}^{\circ }}e={45}^{\circ }$

from fig.,

$\angle \delta ={15}^{\circ }$

Wavelength of electron microscope can be upto $100,000$ times shorter than visible light and thus have a higher resolving power.