2. What is the angle of refraction for light entering water from air when the light strikes the water at 20° to the normal? The index of refraction of air is 1 and 1.33
for water.
a) 22.70
b) 5.90
C) 12.9°
d) 14.90
e) 54.30

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

a displacement distance is size of displ

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .