Light & vision

Question 1

What is light?

Answer 1

Both a particle (photon) and a wave

Transverse electromagnetic wave

Question 2

Define a transverse wave

Answer 2

“A wave in which the medium vibrates at right angles to the direction of the propagation” - Quote ( ,2022)

Question 3

What is the speed of light?

Answer 3

300,000 km/s

Question 4

What is the length of visible light?

Answer 4

400-700nm

Question 5

List types of electromagnetic waves from longest to shortest waves

Answer 5

Radio waves, Microwaves, Infrared light, Visible light, UV, X-rays, Gamma rays

Question 6

Define polarisation in the context of light waves

Answer 6

When light is polarised/goes through polarised medium, it oscillates on one plane only

Question 7

Define unpolarised light

Answer 7

This is ‘normal’ light - where the electromagnetic fields oscillate in all directions

Question 8

Refractive conditions: What is HYPEROPIA?

Where do images appear?

Answer 8

Long sightedness

Images focus behind retina

Question 9

Refractive conditions: What is MYOPIA?

Where do images appear?

Answer 9

Short sightedness

Images focus in front of retina

Question 10

What type of lens is used to correct myopia?

Answer 10

Concave lens is used to correct ____

Question 11

What type of lens is used to correct hyperopia?

Answer 11

Convex lens is used to correct _____