Total Internal Reflection _ GCSE Physics

The video explains how optical fibers transmit information using visible light and total internal reflection. It describes the conditions necessary for total internal reflection, including the critical angle and refractive index. The video also provides examples of applications, such as broadband communication and keyhole surgery, highlighting the importance of optical fibers in modern technology.

What is the primary mechanism that allows optical fibers to transmit information?

• Total internal reflection

• Absorption

• Diffraction

• Refraction

Under what condition does total internal reflection occur?

• When light is absorbed by the medium

• When the angle of incidence is greater than the critical angle

• When light travels from a less dense to a denser medium

• When the angle of incidence is less than the critical angle

How does increasing the angle of incidence affect light behavior in optical fibers?

• More light is absorbed

• More light is refracted out

• More light is internally reflected

• Light speed increases

What is the relationship between refractive index and critical angle?

• Refractive index is the sine of the critical angle

• Refractive index is 1 over the sine of the critical angle

• Refractive index is the cosine of the critical angle

• Refractive index is the tangent of the critical angle

Which of the following is a practical application of optical fibers?

• Wind turbines

• Solar panels

• Heating systems

• Keyhole surgery cameras