Huygens' wave theory allows us to know the:

1.	wavelength of the wave.
2.	velocity of the wave.
3.	amplitude of the wave.
4.	propagation of the wavefront.

The graph between resolving power and accelerating potential V for an electron microscope is (P is resolving power):

1.		2.
3.		4.

In Young's double-slit experiment, an electron beam is used to obtain an interference pattern. If the speed of electrons is increased:

Huygen's principle for secondary wavelets may be used to:

In a YDSE, let X and Y be the upper and lower slits. A thin film of thickness t and refractive index $\mu$ is placed in front of X. Let $\beta$ = fringe width. The central maximum will shift 

1.  Downward

2.  Upward

3.  By $\left(\mathrm{\mu }-1\right)\mathrm{t}\frac{\mathrm{\beta }}{\mathrm{\lambda }}$

4.  Both (2) & (3)

Given below are two statements: 
 

Given below are two statements: 
 

Given below are two statements: 
 

Given below are two statements: 
 

Given below are two statements: