Lesson 5

TELESCOPEYs (you should look in to it :D)

you need lens and an eye to use

reflection is light bouncing off things

refraction is the bending of light also happens with sound water and other waves) as it passes through from one medium to another

the light rays move at different speed while entering a different medium which causes it to bend

light theory

light can exhibit both a wave theory and a particle theory at the same time

much of the time, light behaves like a wave

light waves are also called electromagnetic waves because they're made of both electric and magnetic fields

tangent: in geometry the tangent link to a plane curve at a given point is the straight line that just touches the curve at that point Leibniz defined it as the line passing through a pair of infinitely close points on the curve

The Huygens-Fresnel principle states that every point on a waveform is a source of wavelets. These wavelets are full of shit cause I can't copy finish.

When light is reflected from a flat and smooth mirror, it bounces off at the same angle in the opposite direction from which it hit. For example, if the light hits a flat or plane mirror at 30-degrees from the left, it will bounce at a 30-degree angle to the right

BUT WHAT IF THE REFLECTO THINGY IS NOT FLET

Supposedly light particles must always travel in straight lines. If the particles encounter the end of a barrier they will cast a shadow because the particles not blocked by the barrier continue on in a straight line and cannot spread out behind the edge. The results obtained from the light diffraction experiments on a much smaller scale do not agree with this. When light is passed through a narrow slit the beam spreads and becomes wider than expected so hat is the credibility of the wave theory of light .

How can we apply what we have learns

Basically telescope uses 2 convex lenses

Reflector telescope uses a mirror to gather and focus light.

Compound telescopes use both refractor and reflector elements in their design.

Compound telescope have a long focal length

And have a short tube

REFLECTION TIME:

light rays go boing boing

1 thing i like about the presentation:

i could here what he said so i did have any problems listening

1 thing i dont like about the presentation:

they were jumping through the slides so fast it made the flash look like a tortise

1 thing they can do better:

PLS give us more time to copy down

also the explanation is a bit complicated

but understandable

1 last random comment:

my back hurts

3 images are in my notes

Hooray!!!!