F3 Phy (easy)

When the light entered to the air cavity from the glass,
the light is travelled from denser to less denser medium,
so the light bends away from the normal.
So the answer should be either C or D.

In addition, the shorter the wavelength, the more the wave refracts. Since violet light has the shorter wavelength than red light, violet bands more compare to red light.
So the answer is D.