the ray that runs from the centre of the circle to the point of tangency
‘The only ray of hope we had was the anchor rope,’ said Mr. Podiyan.
A ray of hope appears in the form of Mary Burke, the daughter of a heart attack victim who strikes a chord with the troubled Pierce.
It is always wise to make a sketch of the system, including the ray bundles for the on-axis and off-axis imagery.
A light ray grazing the surface under those circumstances is bent, or refracted, upward.
Mirrors, spherical or otherwise, operate on the principle that the angle of reflection of a ray of light equals the angle at which it strikes the mirror's surface.
Some tenants felt Christmas would not generate big profit margins for them, but others saw a ray of hope with a late-buying binge.
if only I could see some ray of hope
All coding elements redirect light so that no ray, besides the on-axis ray , travels toward the traditional geometric focus point.
They had caught a manta ray and said it was good eating.