Please help me

Dear student,
1)Wavelength is inversely proportional to the deviation in the path of the light.
(i) Red light suffers the least amount of deviation
(ii) violet light suffers the maximum deviation
2)Total Internal Reflection(TIR) and Refraction
3)The sky appears dark instead of blue to passengers because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight is not scattered, no scattered light reach the eyes of the passengers and the sky appears black to them.
4)Scattering of light depends upon the wavelength of light.
Your 4th question seems to be incomplete. I have provided the answer of first part, please provide the full question in another thread so that we can give you answer,
Regards
Regards

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