U5.3 – Refractive Index

4

Refractive Index

1 / 10

Light travels at 2.25x108 ms-1 in water, what is the refractive index of water?

2 / 10

Why is cladding is required in fibre optics?

3 / 10

The refractive index of glass is 1.52, what speed does light travel through it?

4 / 10

This diagram shows a ray of light travelling through a semi-circular glass block. Which letter would represent the critical angle if TIR occurred?

5 / 10

Light passes from air through a glass container and into olive oil. Select the diagram that best shows this. Refractive indexes are as follows: glass = 1.52 and oil = 1.47

6 / 10

This image shows a cross section of fibre optic cable. Select why the ray enters the cladding.

7 / 10

The speed of light in the core of a fibre optic cable is 2.04x108 ms-1. Calculate the refractive index.

8 / 10

Calculate the critical angle for the boundary when light leaves a medium of refractive index 1.52 and enters air.

9 / 10

Light travelling through air is incident on glass at an angle of 23°. The refractive index of the glass is 1.52. Calculate the angle of refraction.

10 / 10

In a fibre optic cable the core has a refractive index of 1.52 and it's cladding is 1.34. Calculate the critical angle at the boundary between the core and cladding of the cable.

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