Help me by answering the below three questions please!!! :( I will appreciate yo

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Help me by answering the below three questions please!!! :( I will appreciate your help greatly!

Briefly explain how an oceanographer might use sonar to measure the depth of the ocean. Blue light bends more than red light when entering glass from air because: (a) red light travels faster than blue light in glass, (b) blue light travels faster than red light in glass, (c) red light travels faster than blue light in air, (d) blue light travels faster than red light in air. Hints:(i) Choose one. (ii) Air is a thin gas so that its index of refraction is nearly 1. (iii) Index of refraction of glass is noticably bigger than 1. Why does the sun appear above the horizon when it is actually below the geometrical horizon during a sunset? Hint: The answer lies in the refraction through the atmosphere that gets thinner (i.e., closer to vacuum) as you go up above the earth. It helps to draw a picture of a section of a spherical earth, draw a horizontal line from your point toward the sun setting below this horizontal (horizon) and think about how the light rays from the setting sun can possibly get to your eyes, even though the sun is physically below the horizon.

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