Refraction of light

Question 1

Small angle of incidence

Answer 1

Most light refracted however small bit is reflected

Question 2

Critical angle

Answer 2

Refraction is bent through 90 degrees from the normal, refracted ray is weaker than the reflected ray

Question 3

Angle of incidence>critical angle

Answer 3

All light is reflected, known as Total internal reflection

Question 4

Requirements for a multimode optical fibre

Answer 4

Angle of incidence need to be greater than critical angle to ensure total internal reflection, glass cladding needs to be less dense than the fibre

Question 5

Advantages of multimode

Answer 5

Cheap to maintain and install

Question 6

Disadvantages of multimode

Answer 6

Limited distance and speed

Question 7

Monomode optical fibre

Answer 7

Single wavelength due to very small hole, use lasers

Question 8

Advantages of monomode

Answer 8

Efficient due to straight line and no reflections
Much faster

Question 9

Disadvantages of monomode

Answer 9

Expensive to produce and maintain
Only 1 wavelength in a cable at a time

Question 10

Equation for refractive index`

Answer 10

n=speed of light (c)/speed of light in material