How canwe measure the refresh rate of the crt, stereo devices and lcd? ifrefresh rate measurement of anyone is not possible then explainwhy?

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.

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