Question

What do you mean by the following terms:

(i) Numerical Apperture        (ii) Critical Angle (iii) Acceptance cone​

Answer 1

Answer:

• the numerical aperture of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.
• the critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees.
• the cone in which the light incident at acceptance angle or less than the acceptance angle and then the light can propagate through the fiber after total internal reflection is acceptance cone

Answer 2

Answer:

I) Numerical Aperture :- The numerical aperture of an optical system is defined as the product of the refractive index of the beam from which the light input is received and the sine of the maximum ray angle against the axis, for which light can be transmitted through the system based on purely geometric considerations (ray optics)

ii) Critical Angle:- Critical angle, in optics, the greatest angle at which a ray of light, travelling in one transparent medium, can strike the boundary between that medium and a second of lower refractive index without being totally reflected within the first medium.

iii) Acceptance cone :- It is the cone in which the light incident at acceptance angle or less than the acceptance angle and then the light can propagate through the fiber after total internal reflection

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