Calculate the angle of incidence of light ray incident on surface of a plastic slab of refractive index v3, if the angle of refraction
is 30°
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Plss anybody know how to do this? ? i need the answers from a through d

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?