Heat capacity:
1. Heat capacity is the amount of heat energy required to raise the temperature of the entire body by $1^{\circ}C$.
2. Heat capacity depends both on the nature of the substance and the mass of the body. As the mass of the body increases the heat capacity of the body also increases.
3. Heat capacity
$C=\frac{Q}{\Delta t}\\ C = mass (m) \times specific \: heat \: capacity (c)$
4. The unit of Heat capacity is $J-K^{-1}$.
Specific heat capacity:
1. Specific heat capacity is the amount of heat energy required to raise the temperature of the unit mass of the body by $1^{\circ}C$.
2. Specific heat capacity does not depend on the mass of the body, but it is the characteristic property of the substance of the body.
3. Specific heat capacity
$C=\frac{Q}{m\Delta t} \\
C=\frac{Heat \: Capacity \: (C)}{Mass (m)}$
4. Its unit is $J-kg^{-l}-K^{-1}$.
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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