Answer:
Refresh rate means how many times the image on the screen is redrawn in a second.It is measured in hertz.
We can measure refresh rate of all of the devices listed in the question.
CRT Refresh rate measurement:-
The refresh rate can be measured by dividing the scanning rate by count of horizontal lines multiplied by 1.05.
Stereo Devices Refresh Rate measurement:-
When LCD's are used for stereo 3 D displays, the refresh rate is divided by 2, because we have two eyes and each one needs a distinct picture. For this reason,it is suggested to use a display of at least 120 Hz refresh rate, because on divided by 2 this rate is 60 Hz.For example 70 Hz non-stereo is 140 Hz stereo, and 80 Hz non-stereo is 160 Hz stereo.
LCD Refresh rate measurement:-
Refresh rate of a LCD is the number of times per second in which the data it is being redrawn by the display.