Light&sound

Question 1

What form of energy is light?

Answer 1

Electromagnetic radiation

Question 2

Where is the normal located?

Answer 2

At a right angle from the interface

Question 3

What is the light entering a glass prism called?

Answer 3

Incident Ray

Question 4

What is the light called that travels through a glass prism called?

Answer 4

Refracted Ray

Question 5

Bending of light is called

Answer 5

Refraction

Question 6

When light travels from a less dense medium to a more dense medium, the Ray bends…

Answer 6

Towards the normal

Question 7

When a Ray moves from a more dense substance to a less dense substance the Ray…

Answer 7

Bends away from the normal.

Question 8

Light travels at ‘’ speed through air

Answer 8

Higher

Question 9

What objects fit under the transparent category?

Answer 9

Clear glass, shallow water

Question 10

What objects fit under the opaque category

Answer 10

Bricks, a piece of wood, a desk and a football

Question 11

What objects fit under the translucent category?

Answer 11

Tissue paper,fingernails,frosted glass

Question 12

When light hits an transparent surface it…

Answer 12

Is transmitted through it or reflected off it

Question 13

When light hits a translucent surface it…

Answer 13

Is transmitted through it or reflected off it.

Question 14

When light hits an opaque surface it…

Answer 14

Is absorbed into it or reflected off it

Question 15

How fast do light waves travel per second?

Answer 15

300,000km per second

Question 16

When light is shone on a mirror, what is the Ray called that leaves the mirror?

Answer 16

The reflected Ray.

Question 17

Why does an object appear closer when looking at it through water?

Answer 17

Because reflected light off the object bends away from the normal when it enters the air.

Question 18

When can total internal reflection occur?

Answer 18

Total internal reflection can only occur when light passes through a substance of lower refractive index. TIR occurs because the Ray can no longer refract, so instead it totally internally refracts: it has nowhere else to go.

Question 19

What medium doe slight travel the slowest in?

Answer 19

A Dimond. It has a higher refractive index. And the speed of light travels at 124,000 km/s

Question 20

When the refractive index is higher it means?….

Answer 20

That the medium is denser and light travels slower through it.

Question 21

Total internal reflection never occurs when light travels into a substance of greater refractive index because…

Answer 21

The refracted Ray bends towards the normal through the interface.

Question 22

What is the cornea and where is it located?

Answer 22

The cornea bends light into the lens. It lies in front of the iris (coloured part of the eye)

Question 23

What is the lens?

Answer 23

A flexible structure that enables light to be focused on the retina.

Question 24

What is the retina and where is it located?

Answer 24

The cells on the retina called cone rod cells absorb light rays and turn them into electrical signals. The retina is located at the back of the eye.

Question 25

What is vitreous humour?

Answer 25

Clear fluid between the lens and the retina.

Question 26

What is the white of the eye called?

Answer 26

Sclera.

Question 27

What does the pupil do?

Answer 27

Controls the amount of light entering the eye.

Question 28

Where do the electrical signals that the retina created travel?

Answer 28

To the optic nerve. It travels the signals to the brain from the retina

Question 29

Longsightedness means a person struggles to see images…

Answer 29

Closer to them

Question 30

Shortsightedness means-

Answer 30

a person struggles to see an image further away from them.