Q.
Assertion Special functions such as trigonometric, logarithmic and exponential functions are dimensionless. Reason A pure number, ratio of similar physical quantities, such as angle and refractive index, has no dimensions.
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Physical World, Units and Measurements
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Solution:
The arguments of special functions, such as the trigonometric, logarithmic and exponential functions must be dimensionless.
A pure number, ratio of similar physical quantities, such as angle as the ratio (length/length), refractive index as the ratio of (speed of light in vacuum/speed of light in medium), etc. has no dimensions.
Therefore, Assertion and Reason are correct but Reason is not the correct explanation of Assertion.