Answer: The angle of incidence at which the light will fully be polarized is 60°
Explanation:
To find out the angle of incidence θB for which reflected light is fully polarized we use the equation
n1 sinθB = n2sin(90°− θB) = n 2cosθB
Since n1 is the index of refraction for medium 1 and n2 is the medium of refraction for medium 2 we then solve the equation to get
θB = tan −1 (n2/n1)
= tan −1 (2.22/1.28)=60.0°
Answer:
Average velocity = 30 miles per hour
Explanation:
Given that
Velocity for uphill = 20 miles per hour
Velocity for downhill = 60 miles per hour
We know that
Distance = Velocity x time
Total distance = Average velocity x total time
Lets take distance from home to school is s
Time taken from home to school= s/20 hr
Time taken from school to home= s/60 hr
Total time =s/20+s/60
Total distance = Average velocity x total time
s + s = Average velocity x (s/20+s/60)
So average velocity = 30 miles per hour
D. A physical change means that the object can be broken into different pieces, but it still remains that same object.
I would go with C because all the rest of the answer are sitting on something.
