EK physic 1001 917 Snell's law

[GRod18]

A certain animal swims at 4.0 m/s. If the animal takes the fastest path from its position on land to its home in the water, and that path is the one shown in the diagram below, how fast is the animal on land?

I tried plugging in numbers to EK explanation, but still not getting this answer:

Answer is 6.8 m/s


Also I was confused on this dispersion question.

White light strikes a glass surface from air at an angle of 30 degrees. The light is split into colors in a phenomenon known as dispersion. What color light will have the greatest angle of refraction?

I always thought that the color that bends away from normal the most is the one with the highest frequency which would be violet light or is this talking about like when it initially enters the glass?

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[Rabolisk]

With respect to the second one, you thought right. Now read the question carefully again.

 

[GRod18]

geez rab you still here? lol..

that first question doesn't seem to be MCAT difficulty does it?

 

[Chocolatebear89]

So wait, GRod thought wrong then, since high frequency=bends the most, but not from the normal, since that would mean angle of refraction.

 

[fizzgig]

how come i'm supposed to use the angles given in snells for the first one vs using the angle from the line perpendicular to the water surface as i do with light? is that a common thing i'm supposed to just know?