A light ray parallel to the optical axis of a glass sphere of radius R enters the sphere at height H above the axis (H<R).

Question

The ray is refracted from air with ¥è = 34¨¬ into the sphere of unknown refractive index.

If the refracted ray emerges at the point P where the sphere intercepts the optical axis, what is the refractive index of the sphere?

Answer 1

How do you define the optical axis of a sphere ? What is the meaning of your
è and ¨¬ characters?

Answer 2

¥è = 34¨¬

I think it turned into different characters after copying and pasting it onto the website. I think the ¥è represented "theta" (which usually symbolizes an angle) and ¨¬ actually stood for degrees for an angle.