give reason how speed of red light is compared with speed of blue light in vacuum and that of an glass

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Dear Student,
In vaccum both have same speed.
In glass- Red light travels faster than Blue light.
and its not always true for red light to be faster than blue light,it depends on material and its refractive index.

Regards

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give reason how speed of red light is compared with speed of blue light in vacuum and that of an glass

Dear Student, In vaccum both have same speed. In glass- Red light travels faster than Blue light. and its not always true for red light to be faster than blue light,it depends on material and its refractive index. Regards

Dear Student,
In vaccum both have same speed.
In glass- Red light travels faster than Blue light.
and its not always true for red light to be faster than blue light,it depends on material and its refractive index.

Regards