Why should the y-intercept of any beer's law plot equal zero? consider the experimental set-up and answer from a conceptual perspective

Answer has been given below.

Explanation:

According to Beer's law-     represents molar absorptivity of a solution, c represents molarity of solution and l represents cell thickness.Measurement of absorption is done by taking solutions of a particular solute with different concentrations. A particular solute has a particular maximum absorption wavelength. So absorption experiment is done by keeping this maximum absorption wavelength constant. remains constant for a particular solute and a particular    absorption wavelength.During absorption experiment, same cuvette with a particular cell thickness is used. So "l" remains constant during experiment.So the variables are "c" and "A" as absorption depends on concentration of solution.Therefore Beer's law can be considered as  y=mx relation, where y is equivalent to "A" , x is equivalent to "c" and m is equivalent to "".Now, y=mx represents a straight line passing through origin. Therefore  y-intercept of any Beer's law plot equal to zero.

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