Ch-9 Light Reflection and Refraction

What is refraction of light?

• Refraction of light is the reflection of light off a surface

• Refraction of light is the scattering of light in all directions

• Refraction of light is the bending of light as it passes from one medium to another due to a change in its speed.

• Refraction of light is the absorption of light by a medium

Define refractive index.

• Refractive index is the measure of temperature in a material.

• Refractive index is the amount of light absorbed by a material.

• Refractive index is the force of gravity acting on light in a material.

• Refractive index is the ratio of the speed of light in a vacuum to the speed of light in the material.

State Snell's Law.

• The wavelength of light changes when passing through different mediums

• The speed of light is constant in all mediums

• The angle of incidence is equal to the angle of reflection

• The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant when light passes from one medium to another.

What happens to the speed of light when it enters a medium with a higher refractive index?

• It remains the same

• It increases

• It becomes zero

• It decreases

Explain total internal reflection.

• Total internal reflection is the absorption of light at the boundary between two media with different refractive indices.

• Total internal reflection occurs when the angle of incidence is less than the critical angle.

• Total internal reflection is the reflection of all the incident light off the boundary between two media with different refractive indices, occurring when the angle of incidence is greater than the critical angle.

• Total internal reflection is the refraction of light off the boundary between two media.

How does the angle of refraction change with the angle of incidence?

• The angle of refraction remains constant regardless of the angle of incidence.

• The angle of refraction changes in relation to the angle of incidence based on Snell's Law.

• The angle of refraction is inversely proportional to the angle of incidence.

• The angle of refraction decreases as the angle of incidence increases.

What is the formula for calculating refractive index?

• Refractive Index = Frequency of Light in Vacuum / Frequency of Light in Medium

• Refractive Index = Speed of Light in Vacuum / Speed of Light in Medium

• Refractive Index = Wavelength of Light in Vacuum / Wavelength of Light in Medium

• Refractive Index = Speed of Sound in Vacuum / Speed of Sound in Medium

Give an example of a situation where refraction of light occurs.

• A book on a table

• A straw placed in a glass of water

• A rock in a pond

• A pencil in a glass of water

What is the critical angle in the context of light refraction?

• The critical angle in the context of light refraction is the angle of incidence that results in the refracted ray being at 90 degrees to the normal line.

• The critical angle is not affected by the medium through which light is passing

• The critical angle is always less than the angle of incidence

• The critical angle is the angle of refraction that results in total internal reflection

How does the refractive index of a medium affect the speed of light?

• The refractive index of a medium has no impact on the speed of light

• The refractive index of a medium affects the speed of light by determining how much the light waves slow down when passing through the medium. A higher refractive index means the light will travel slower in that medium.

• The speed of light is not affected by the refractive index of a medium

• A higher refractive index means the light will travel faster in that medium