# Plane and solid angle of light

The light is emitted in all the directions from source and it is not limited to a particular plane, now you describe plane angle and solid angle of the light.
Plane angle : The plane angle may be defined as below When two straight lines laying on the same plane and meet a point O they will be the angle between the lines at a meeting point. This angle is known as the plane angle. In this figure, It is shown the plane angle. AOB is the plane angle. And the Plane angle is represented in radians.  Solid angle: The solid angle has defined an angle Which is subtended at a point in space by an area. In case of plan angle the area is enclosed by two lines, but in case of solid angle, the area is enclosed by new videos lines laying on this Surface and meeting at a point stop the solid angle is shown in the figure.The major of solid angle is given below.  From a point of light source Which is radiated out energy in all directions. Let, The point source as Centre and any distance R as radius, imagine a spherical surface to be constructed and the lines of flux Will cross area a forming a cone. Since the surface area of the sphere is πR2, And the total solid angle subtended by the points in the View of the equation is given as ## Recent Post Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true? a) The saturation voltage VCF of silicon transistor is more than germanium transistor. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. c) The saturation voltage VCE for silicon transistor is same as that for germanium. d) The saturation voltage VCE for silicon transistor is lower than germanium transistor.Read more... Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct? a) Inner electrons are always present in the semiconductor. b) Bound electrons are always present in the semiconductor. c) Free electrons are always present in the semiconductor. d) Inner and bound electrons are always present in the semiconductor.Read more... Multiple Choice Question (MCQ) of Electronics page-15:211. The materials whose electrical conductivity is usually less than 1 × 106 mho/m are a) Semiconductors b) Conductors c) Insulators d) AlloysRead more... Multiple Choice Question (MCQ) of Electronics page-14:196. In which of the following device the base resistors are not added in the package but added externally? a) UJT b) CUJT c) PUT d) None of the aboveRead more... Multiple Choice Question (MCQ) of Electronics page-13:181. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes d) Electrons e) Holes and electrons simultaneouslyRead more...

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