cse • paper_1 • waves_oscillationscse-1994-subject-02-002
Phase velocity — UPSC CSE 1994 Physics PYQ
Buy PYQ Solution Manual →Distinguish between phase velocity and group velocity. Calling group velocity C and phade velocity C in a medium of refractive index n, establish the relation C_g = C \left(1 + \frac{\lambda}{n} \frac{dn}{d\lambda}\right) where \lambda refers to the wavelength of the related light in vacuum
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