Question

Deline
il solid angle - Difine.
it Adhessure force..
il critical angle of incidence
iv magnetic meredian and angle ​

Answer 1

(i) solid angle - In geometry, a solid angle (symbol: Ω) is a measure of the amount of the field of view from some particular point that a given object covers.

(ii) adhesive force - They are the attractive force between the unlike molecules.

(iii) critical angle of incidence - critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees.

(iv) magnetic meridian - It is a line passing through both magnetic poles of the earth.

(v) magnetic angle - Magnetic inclination or Angle of dip is the angle made with the horizontal by the Earth's magnetic field lines.