Thickness = 2 mm
speed of light in medium = speed of light in vacuum / refractive index
= [tex]\frac {3 \times10^8} {1.5}[/tex]
[tex]= 2\times10^8 m/s[/tex]
Time = distance / speed
= [tex]\frac{2\times10^{-3}}{2\times10^{-11}}[/tex]
[tex]= 1\times10^{-14}[/tex] sec
Speed is characterized as the rate of change of position of an object in any direction. Speed is measured as the proportion of distance to the time in which the distance was covered. Speed may be a scalar amount because it has as it were direction and no magnitude.SI unit of speed is ms-1.
Several types of speeds are as follows:
Uniform speed
Variable speed
Instantaneous speed
Average speed
Relative Speed
To learn more about speed ,visit;
https://brainly.com/question/13263542
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