Solution:
(a) Expression of the relation between the speed of light (c) in the air and in glass (v) is as follows –
μ = c / v
or we can write
c = 1.5 v
(b) Let the wavelength of light in glass be given by λ1
Then, using the expression =>
μ = λ / λ1
Therefore, wavelength of light in glass λ1 = λ / 1.5