A ray of monochromatic light passes from air into a block of glass as shown - Scottish Highers Physics - Question 14 - 2018

To find the frequency of light in the glass, we use the fact that frequency remains constant when light passes from one medium to another:

$f_{glass} = f_{air}$

Given that the refractive index ($n$) is $1.50$, the relationship between the speed of light in air ($c$) and the speed of light in glass ($v$) is given by:

$v = \frac{c}{n}$

Calculating the speed of light in glass, we find:

$v = \frac{3 \times 10^8}{1.50} = 2 \times 10^8 \text{ m/s}$

Therefore, the frequency in glass remains:

$f_{glass} = f_{air} = 4.76 \times 10^{14} \text{ Hz}$

Matching this with the provided options, we find that option D) $4.76 \times 10^{10}$ Hz is most likely a typographical error where the correct answer should have been $4.76 \times 10^{14}$ Hz. Thus, the answer selected from the list is D.