There are the following differences between a potentiometer and a voltmeter given below:
Potentiometer:
1.) It is based on null method.
2.) It gives an accurate value of emf.
3.) While measuring emf, it does not draw any current from the cell.
4.) Resistance of potentiometer wire becomes infinite while measuring emf.
5.) It can be used for various experimental purposes.
6.) It can not be taken conveniently from one place to another place.
Voltmeter:
1.) It is based on the deflection method.
2.) It does not give an accurate value of emf.
3.) While measuring emf, it draws some current from the cell. Hence it reads slightly less than the actual emf.
4.) The resistance of the voltmeter is high enough but not infinite.
5.) It can be used to measure potential differences only.
6.) It can be conveniently taken from one place to another place.
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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