reflection of light

[MedGrl@2022]

Does light need a big medium shift (with different indexes of refraction) in order to reflect its light?

I am asking in relation to question 91 in the physics self assessment. It says that light would not reflect from the coma gases significantly thus one sees the coma dust reflects the sunlight enabling us to see the coma.

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[EmergentCough]

Its a correlation between your indexes of refraction and your angles. Critical angles are sinTheta2=90=1. Any angle larger than this will cause reflection.