When light of wavelength lamda_0 in vaccum travels through same thickness t in glass and water, the difference in the number of waves is _____. (Refractive indicates of glass and water are mu_g and mu_w respectively).

When light of wavelength lamda_0 in vaccum travels through same thickn

1.	When light of wavelength lamda_0 in vaccum travels through same thickness t in glass and water, the difference in the number of waves is _____. (Refractive indicates of glass and water are mu_g and mu_w respectively).
Answer» Solution :We KNOW NUMBER of waves of a given light in a MEDIUM of REFRACTIVE index `mu` is `(t mu)/lamda_0` `therefore` Difference in number of waves `=t/ mu_0 (m_g-mu_w)` where `mu_g and mu_w` are the refractive indicies of glass and WATER respectively.