If angle of incidence is 90 and angle of refraction is 90, then if the ray forming these angles , is passing from air to glass medium, then how snell's law help in finding refractive index of glass?

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Dear Student
If a Ray is passing from Air to Glass then this is not possible to have the same angle i.e the angle of incidence cannot be equal to the angle of refraction .
Regards

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If angle of incidence is 90 and angle of refraction is 90, then if the ray forming these angles , is passing from air to glass medium, then how snell's law help in finding refractive index of glass?

Dear Student If a Ray is passing from Air to Glass then this is not possible to have the same angle i.e the angle of incidence cannot be equal to the angle of refraction . Regards

Dear Student
If a Ray is passing from Air to Glass then this is not possible to have the same angle i.e the angle of incidence cannot be equal to the angle of refraction .
Regards