TOTAL INTERNAL REFLECTION

Open Ended

Why is it important to understand how light behaves when it moves between different media, such as glass and air?

Multiple Choice

What is the critical angle in the context of refraction?

• The angle of incidence for which the angle of refraction becomes 90°

• The angle of incidence for which the angle of reflection becomes 0°

• The angle of refraction for which the angle of incidence becomes 90°

• The angle of incidence for which the angle of refraction becomes 0°

Multiple Select

Which of the following are necessary conditions for total internal reflection to occur?

• Light must travel from a denser to a rarer medium

• The angle of incidence must be greater than the critical angle

• The angle of incidence must be less than the critical angle

• Light must travel from a rarer to a denser medium

Open Ended

Explain the phenomenon of total internal reflection and the conditions required for it to occur.

Multiple Choice

In the context of total internal reflection, what happens when the angle of incidence is equal to the critical angle?

• The refracted ray grazes along the interface

• The light ray is totally reflected back

• The light ray is absorbed

• The angle of refraction becomes zero

Open Ended

Describe how total internal reflection leads to the formation of a mirage in a desert.

Multiple Choice

Which of the following is NOT a main part of an optical fibre?

• Core

• Cladding

• Buffer coating

• Reflector

Open Ended

Explain how light travels through an optical fibre and the role of the core and cladding in this process.

Multiple Select

Which of the following are applications of optical fibres?

• Medical imaging

• Internet communication

• Cooking food

• Lighting decorations

Open Ended

Why does a diamond sparkle more than other transparent materials?

Open Ended

How does the concept of total internal reflection relate to the bending of light rays at the boundary between different media?

Multiple Choice

What happens to a light ray when it passes from a denser medium to a rarer medium?

• It bends away from the normal

• It bends towards the normal

• It does not bend

• It gets absorbed