The angle of incidence from air to glass at the point on the hemispherical glass slab is

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Solution

Angle of incident
The angle between the surface normal and the incident light ray is the angle of incident
In this case, the incident light rays incident on point O and pass through the center of the semicircle after the refraction.
We know for a circle surface normal is directed along the center.
So, from the figure, the direction of the surface normal and light is the same.
So, the angle between them is zero.
Diagram
Therefore, the angle of the incident is $0^{o}$ .

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