Maxwell's second equation is the differential form of Gauss's law of magnetism.
As magnetic, monopoles do not exist in magnets and the magnetic field lines form closed loops. There is no source of the magnetic field from which the lines will either only diverge or only converge. Hence the divergence of the magnetic field is zero.
$\overrightarrow{\nabla}. \overrightarrow{B}=0$
Derivation-
According to Gauss's law of magnetism
$\oint_{S} \overrightarrow{B}. \overrightarrow{dS}=0 \qquad(1)$
Now apply the Gauss's divergence theorem-
$\oint_{S} \overrightarrow{B}. \overrightarrow{dS}= \oint_{v} \overrightarrow{\nabla}.\overrightarrow{B}.dV \qquad (2)$
from equation $(1)$ equation $(2)$
$\oint_{v} (\overrightarrow{\nabla}.\overrightarrow{B}).dV =0$
$\overrightarrow{\nabla}.\overrightarrow{B} =0$
Angle of Acceptance → If incident angle of light on the core for which the incident angle on the core-cladding interface equals the critical angle then incident angle of light on the core is called the "Angle of Acceptance. Transmission of light when the incident angle is equal to the acceptance angle If the incident angle is greater than the acceptance angle i.e. $\theta_{i}>\theta_{0}$ then the angle of incidence on the core-cladding interface will be less than the critical angle due to which part of the incident light is transmitted into cladding as shown in the figure below Transmission of light when the incident angle is greater than the acceptance angle If the incident angle is less than the acceptance angle i.e. $\theta_{i}<\theta_{0}$ then the angle of incidence on the core-cladding interface will be greater than the critical angle for which total internal reflection takes place inside the core. As shown in the figure below Transmission of lig
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