Topic 1
Light is a form of _____ that you can _____.
State the Law of Reflection
The angle of reflection equals the angle of incidence.
This is the definition of refraction:
Bending of light when it travels from one medium to another.
This its the definition of a lens:
A curved piece of transparent material, usually glass or plastic.
When striking a surface, light can be ______, ______, or ______.
Reflected, refracted, absorbed.
These are the 5 Properties of Light
Light travels in straight lines.
Light can be reflected, refracted or absorbed.
Light can bend - which is known as diffraction.
Light sources can be either natural or artificial.
White light is made up of all the colours of the rainbow.
Why does a mirror reflect light better than paper?
A mirror's surface is smooth, so light bounces off uniformly, whereas a paper's surface is rough, and light bounces off randomly.
Light bends _____ the normal when it travels from air to water (denser) and _____ the normal when it travels from water to air (less dense).
Toward
Away from
Concave lenses cause light to_____, whereas convex lenses cause light to ______.
Diverge (spread out)
Converge (come together)
This particular liquid is responsible to maintain the spherical shape of the eye.
Vitreous Humor
This is why observatories are located on top of mountains.
Light pollution caused by cities.
List the five parts of a reflection ray diagram
2. Reflected Ray
3. Normal
4. Angle of Incidence
5. Angle of Reflection
These are the five parts of a refraction light diagram:
1. Incident Ray
2. Refracted Ray
3. Normal
4. Angle of Incidence
5. Angle of Refraction
List the nine parts of a human eye:
1. Optic Nerve
2. Retina
3. Lens
4. Iris
5. Pupil
6. Cornea
7. Ciliary Muscle
8. Aqueous Humor
9. Vitreous Humor
The brightness of light indicates how much ______ a surface will receive.
Energy.
The difference between Fluorescent and Phosphorescent light sources.
Fluorescent sources emits light immediately, phosphorescent sources emit light over time.
What are the differences between what you see in a convex vs. concave mirror?
Convex mirrors produce a small, panoramic view of the object
Concave mirrors produce either a large, magnified image or a small, inverted image.
This is how a mirage is formed:
Refraction through the air, caused by a change in temperature between high and low air.
This lens is used in glasses to fix Hyperopia.
Convex Lens.
Hyperopia (far-sightedness) is caused by a short eye, which needs light to converge more on a retina. Convex lenses converge light and therefore are used to cure Hyperopia.
Billiard players use this property of light when playing Pool:
The Law of Reflection
Opaque, because light reflects off its surface, it does not pass through.
This is the difference between a real and virtual reflected image:
A Real Image is an image that is always inverted, meaning the light meets at a single point.
A Virtual Image is an image that is upright, which means that the light never met at a single point.
Why did ancient peoples need to know about refraction?
When hunting fish, it was important to know where the fish was, instead of where it appeared to be due to refraction.
This is the main structural difference between a human eye and a camera.
A human eye is flexible and squishy, whereas a camera is firm and inflexible.
If you look at the sun through a convex lens, this is what you would see:
Your retina would burn because convex lenses concentrate light. You may go blind.