3333 x 10-8cm
5000 x 10-8cm
6666 x10-8cm
750010-8cm
Correct answer is A
n = \(\frac{\text{wavelength in space}}{\text{wavelength in glass}}\)
1.5 = \(\frac{5000 \times 10^{-8}}{\lambda g}\)
\(\lambda\)g = 3333 x 10-8cm
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