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CBSE Class 10 Answered

numerical
Asked by | 25 May, 2009, 09:43: PM
answered-by-expert Expert Answer

wavelength = 600 nm, c = 3 x 108 m / s

n = 1.5

c = frequency x wavelength

frequency in air = 3 x 108/ 6 x 10-7 = 5 x 1014 Hz

n = c / v

speed (v) in glass = 2 x 108 m / s

frequency remains same = 5 x 1014 Hz

since v = frequency x wavelength

wavelength = 2 x 108 / 5 x 1014 = 0.4 x 10-6 = 0.4 micro meter 

 

Answered by | 27 May, 2009, 04:44: PM

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