31.
Which one of the following statement is correct?

32.
The coherence length over which there is a strong relationship between amplitudes is;

34.
"An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as:

37.
Geodimeter is based on:

38.
If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

39.
In case of reflection and refraction of electromagnetic radiation,