Pre-Test Active
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What best describes the relationship between wavelength and frequency in an electromagnetic wave?
O always equal
O no relationship
O directly proportional
O inversely proportional

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

snell's law

refractve index = sin incidence / sin refraction