To solve this problem we will use Snell's law. This law is used to calculate the angle of refraction of light by crossing the separation surface between two means of propagation of light (or any electromagnetic wave) with a different index of refraction.
Where,
= Index of refraction for each material
= Angle of incidence and refraction
A ray of light propagating in a medium with index of refraction 
hitting an angle on the surface of a medium of index 
with 
can be fully reflected inside the medium of highest refractive index:
Refractive index of rarer medium
Refractive index of denser medium
Replacing we have,
the critical angle of this fiber at the glass-plastic interface is 60.07°
Answer:
The golf ball has a constant velocity
Explanation:
Answer:
2.1 m/s
Explanation:
Momentum is conserved, so:
m₁ u₁ + m₂ u₂ = (m₁ + m₂) v
(9.1 kg) (6.6 m/s) = (9.1 kg + 19.3 kg) v
v = 2.1 m/s
Explanation:
Usually when we think of waves, we think of transverse waves. These are waves where points move up and down perpendicular to the motion of the wave. Examples include water waves, whipping a rope, or even doing the "wave" in a crowd. You can think of these as "two dimensional" waves.
Longitudinal waves are waves where points move left or right, parallel to the motion of the wave. In other words, there is compression and expansion of the medium. Examples include sound waves, or pulses in a slinky.
