3d: Light and Sound

How do you find the angle of incidence?

• Between the incident ray and the normal.
• Using a protractor, between the incident ray and the normal.
• Between the incident ray and the boundary.
• Using a protractor, between the incident ray and the boundary.

How do you find the angle of refraction?

• Between the refracted ray and the normal.
• Using a protractor, between the refracted ray and the normal.
• Between the refracted ray and the boundary.
• Using a protractor, between the refracted ray and the boundary.

How do you find the angle of reflection?

• Between the reflected ray and the normal.
• Using a protractor, between the reflected ray and the normal.
• Between the reflected ray and the boundary.
• Using a protractor, between the refracted ray and the boundary.

When light goes from a less (optically) dense medium into a more (optically) dense medium…

• Speed increases
• Speed decreases
• Light refracts towards the normal (angle incidence > angle refraction)
• Light refracts away from the normal (angle incidence < angle refraction)
• Total internal reflection

When light goes from a more (optically) dense medium into a less (optically) dense medium, and the angle of incidence is less than the critical angle…

• Speed increases
• Speed decreases
• Light refracts towards the normal (angle incidence > angle refraction)
• Light refracts away from the normal (angle incidence < angle refraction)
• Total internal reflection

When light goes from a more (optically) dense medium into a less (optically) dense medium, and the angle of incidence is more than the critical angle…

• Speed increases
• Speed decreases
• Light refracts towards the normal (angle incidence > angle refraction)
• Light refracts away from the normal (angle incidence < angle refraction)
• Total internal reflection

What is the relationship between refractive index, angle of incidence, and angle of refraction?

• n = i ÷ r
• n = r ÷ i
• n = sin(i) ÷ sin(r )
• n = sin(r ) ÷ sin(i)
• n = sin(i) × sin(r)

Define critical angle.

• The angle of incidence at which total internal reflection occurs.
• The angle of incidence above which total internal reflection occurs.
• The angle above which total internal reflection occurs.
• The angle of refraction above which total internal reflection occurs.
• The angle of refraction at which total internal reflection occurs.

What is the relationship between refractive index and critical angle?

• n = 1 ÷ c
• n = c ÷ 1
• n = 1 ÷ sin(c )
• n = sin(c ) ÷ 1
• n = sin(1 ) ÷ sin(c )

What are the conditions for total internal reflection?

• Light goes from a less (optically) dense medium into a more (optically) dense medium.
• Llight goes from a more (optically) dense medium into a less (optically) dense medium.
• Angle of incidence is less than the critical angle
• Angle of incidence is more than the critical angle
• Angle of incidence is equal to the critical angle