Unit C: Light and Optics

Question 1

How have microscopes helped further scientific knowledge?

Answer 1

Microscopes helped scientists see things too small for the human eye to see.

Question 2

How is light transmitted?

Answer 2

Through light beams.

Question 3

How have telescopes helped further scientific knowledge?

Answer 3

Allowed astronomers to observe nature in more detail than ever before.

Question 4

What is the absorption of light?

Answer 4

When the light hits the surface and gets converted to another form of energy.

Question 5

What is an object that doesn’t produce light but may reflect it?

Answer 5

Non-luminous.

Question 6

What is an object called that produces light?

Answer 6

Luminous.

Question 7

When light bends as it transfers from one material to another, what is it called?

Answer 7

Refraction.

Question 8

TRUE OR FALSE - Light travels in straight lines.

Answer 8

True.

Question 9

What is the speed of light? (km/s)

Answer 9

299,798 km/s.

Question 10

What are the names of the light lines when it’s being reflected?

Answer 10

Incident ray and reflected ray.

Question 11

Name 2 examples each of natural and artificial light sources.

Answer 11

i.e. - sun, firefly.
- lightbulb, glow sticks.

Question 12

What is the difference between translucent, transparent, and opaque?

Answer 12

Transparent - allows light to pass through with little to no reflection
Translucent - allow some light to pass through
Opaque - does not allow light to pass through

Question 13

TRUE OR FALSE - The angle of incidence is ALWAYS equal to the angle of reflection.

Answer 13

True.

Question 14

What is the line in the middle called of a light reflection ray diagram?

Answer 14

Normal line.

Question 15

What is the difference between convex and concave lenses?

Answer 15

Concave - reflecting surface that is curved inwards, produces converging rays, images appear larger.
Convex - reflecting surface that bulges outwards, produces diverging rays, images appear smaller.

Question 16

TRUE OR FALSE - Images from a concave mirror doesn’t depend on the distance from the focal point.

Answer 16

False.

Question 17

What part of the camera is similar to the following eye parts:
pupil, eyelid, cornea.

Answer 17

Aperture, automatic brightness adjustment, protective glass.

Question 18

Name the parts of an eye. (8)

Answer 18

Pupil, cornea, iris, retina, optic nerve, sclera, lens, ciliary muscles.