Refraction and Reflection Basics

How does light behave as it enters these mediums?

• continue its path as straight line.
• bends toward the normal
• bends away from the normal
• reflects

According to Snell's Law, light passing from air to glass will cause the light to

• maintain its original speed 
• accelerate while it is in glass
• increase its speed
• reduce its speed

The velocity of light in vacuum is _______ m/s

• 3x10⁸

• 3x10¹²

• 3x10⁶

• 3x10¹⁰

Absolute refractive index of any medium is always _______.

• less than 1
• greater than 1
• 1
• 0

The formula to calculate the refractive index using speeds of light is

• n=cv
• n=v/c
• n=c/v
• v=nc

The formula to calculate the refractive index using angles in the different mediums is

• n = (sin i)(sin r)
• n = (sin i) / (sin r)
• n = (sin c) / (sin v)
• n = sin (i/r)

Swimming pools and the ocean look shallower than they really are due to:

• reflection 
• dispersion
• refraction
• total internal reflection

If a pulse of red light and a pulse of blue light travel in vacuum

• The red pulse travels faster because its index of refraction is smaller
• The blue pulse travels faster
• The two pulses travel at the same speed
• The relative speed depends on the exact wavelengths of the red and blue pulses

Tags

NGSS.HS-PS4-1

A light ray hits a plane mirror surface at 20 degrees to the normal. What is the angle between the incident ray and the reflected ray?

• 20^o
• 40^o
• 70^o
• 30^o

The formula for total internal reflection is

• n = 1 / (sin C)
• n = sin C
• n = (sin 1)
• sin (n/C) = 1