Can a sphere has a critial angle

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A sphere cannot have a critical angle in the same way as a flat surface, as critical angles are specific to the geometry of the interface between two media. In the case of a water droplet, light undergoes refraction twice: once upon entering and again upon exiting, leading to the phenomenon of total internal reflection. The angle of refraction varies with the wavelength of light, causing different colors to refract at different angles. This process is similar to how a prism operates, resulting in the formation of a rainbow. Understanding these principles clarifies the optical behavior of light in spherical droplets.
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can a sphere has a critial angle
 
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I'm afraid you'll have to be a little more specific.

- Warren
 
i mean why the water drop can total internal reflect and we can see a rainbow.I THINK CIRLCE DOES NOT HAS TOTAL REFLECT
 
The light is refracted twice. Once when it enters the drop of water, and a second time when it exits. The angle of refraction depends on the wavelenght of the light. So red will be refracted at a different angle than blue. The whole thing works like a prism, and you get your rainbow. Is that what you wanted to know?
 

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