Total Internal Reflection

The critical angle in the more dense medium is such that the angle in the less dense medium is

Total internal reflection occurs when the angle in the more dense medium is

• less than the critical angle

• equal to the critical angle

• greater than the critical angle

• exactly half of the critical angle

For which of the following situations can total internal reflection NOT occur?

• light going from water to air

• light going from glass to water

• light going from diamond to water

• light going from water to glass

Which of the formulae is used to calculate the critical angle of a medium?

What relationship exists between the refractive index of a medium and its critical angle?

• Direct Relationship

• Inverse Relationship

• No Correlation

• Platonic Relationship

The refractive indices of some media are listed below. Which has the greatest critical angle?

W: n=1.20

X: n=1.40

Y: n=1.60

Z: n=1.80

• W

• X

• Y

• Z

What is the critical angle of a medium with refractive index 2.00?

Which of the following does not use the phenomenon of total internal reflection?

• Periscope

• Endoscope

• Pinhole Camera

• Fibre Optic Cable

Why are prisms better for periscopes than mirrors?

• Because prisms will not fog up like mirrors.

• Because prisms reflect light better than mirrors.

• Because prisms have a smaller critical angle that mirrors.

• Because prisms have a greater refractive index than mirrors.

Why is the statement in the picture inaccurate?

• Because diamonds don't shine, they reflect.

• Because diamonds shine dimly, not brightly.

• Because diamonds only absorb light and never emit.

• Because diamonds sparkle like fireworks.