Total internal reflection and critical angle

1. Which of these happens when a light ray is simply shine on the same line as line of normal? (At 0 degrees)

• A light ray is refracted

• The light ray is reflected

• The light ray is diffracted

• The light ray continues without bending

Refer to the FIRST diagram below...

Which of the options below would best fit the diagram?

• i = critical angle (Angle of incidence equal to critical angle)

• i > critical angle (Angle of incidence greater than critical angle)

• i < critical angle (Angle of incidence smaller than critical angle)

Refer to the FIRST diagram below...

Which of the options below would best fit the diagram?

• normal refraction

• total internal reflection

• Refraction along a boundary

Refer to the SECOND diagram below...

Which of the options below would best fit the diagram?

• i = critical angle (Angle of incidence equal to critical angle)

• i > critical angle (Angle of incidence greater than critical angle)

• i < critical angle (Angle of incidence smaller than critical angle)

Refer to the SECOND diagram below...

Which of the options below would best fit the diagram?

• normal refraction

• total internal reflection

• Refraction along a boundary

Refer to the THIRD diagram below...

Which of the options below would best fit the diagram?

• i = critical angle (Angle of incidence equal to critical angle)

• i > critical angle (Angle of incidence greater than critical angle)

• i < critical angle (Angle of incidence smaller than critical angle)

Refer to the THIRD diagram below...

Which of the options below would best fit the diagram?

• normal refraction

• total internal reflection

• Refraction along a boundary

3.1 TRUE or FALSE: "Total internal reflection occurs when the incident angle is smaller than the critical angle"

• TRUE

• FALSE

3.2 TRUE or FALSE: "If the incident angle equals the critical angle of a material, then the refracted ray exits along the boundary of the material"

• TRUE

• FALSE

What is the critical angle in water?

• 49 °C

• 42 °C

• 24 °C