Physics - Geometrical Optics Question with Solution | TestHub

Since the frequency$\mu$of the light does not change as light travels from air into glass,

we have,

${\upsilon }_{\text{a}}=\mu {\mathrm{ \lambda }}_{\text{a}}$and${\upsilon }_{\text{g}}=\mu {\mathrm{ \lambda }}_{\text{g}}$

Therefore$\frac{{\lambda }_{\text{a}}}{{\lambda }_{\text{g}}}=\frac{{\upsilon }_{\text{a}}}{{\upsilon }_{\text{g}}}=\mu$