Red colour has longest wavelength so it has maximum speed in a medium compared to other colours. As it travels with maximum speed in a medium, the refractive index of the medium for Red colour is minimum.
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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