SPS9 Students will investigate the propertiesof waves.

All electromagnetic waves travel at 300,000Km/s in the vacuum of space. This is theSpeed of light.

Air --- slightly less than 300,000km/sWater ------ 226,000 km/sGlass ----- 200,000 km/sDiamond – 124,000 km/s

Photons depend on the frequency of the wavenot the amplitude (energy).

Objects can absorb light, reflect light, and transmit light depending on the typeof matter they are made of.

Opaque only absorbs light and reflects it.The blue cup is an example of an opaque material.

Aluminum foil is an example of an opaquematerial because it reflects light

Translucent materials allow some light to passthrough them. Which cup is translucent?

Transparent materials transmit almost all the light.The clear plastic cup is transparent.

The Law of Reflection says that the angle of Incidence always equals the angle of reflection.

Diffuse reflection

Every material has an index of refraction, the larger the index, the greater the amount by which the speed of light is reduced.

How do we see color?

How do 3 D glasses work? HD glasses?

Block blue lightfor extreme clarityresearch says theyare hype.

Light as waves, photons, and rays!!

Copy:Virtual Image – your brain perceives an imageeven though no light rays pass through it.

Your brain always perceives light rays asthough they have traveled in a straight line.

Copy:Real Image is formed when light rays convergeto form the image.

Virtual Images: Your brain thinks that the lightRays that reflect off of the mirror come from a point behind the mirror.

Draw:Concave Mirror

C = optical axisF = focal point

Real image

Magnified inside the focal pt.

Draw:Convex mirrors divergelight rays. Objects look closer than they truly are.

Virtual Image

Convex Lens is thicker in the middle thanat the edges.

Depending on the position of the lens and the object,the object may appear real or upsidedown.

Concave lens

The image is alwaysvirtual, upright, andSmaller.

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Summary:Light rays bounce off of mirrors andpass through lenses.Virtual and real images depend on thebehavior of these light rays.

Today, you should have been able to• draw a concave and convex mirror• draw a convex and concave lens• explain the difference between a virtual and a real image.

Groups: Choice A Soft Blue Book page 212Using the materials provided you, preparea home interiors presentation on the following:

The types of windows available for an upstairsbathroom. Based on the science of light, and thecustomers’ needs, explain which window worksbest under certain conditions.

Choice B

You are making a presentation and teaching a class for Bass Pro Shop on the art of spear fishing.

Be sure to discuss the behavior of light in different mediums and the index ofrefraction using the materials provided you.

Choice C

You are teaching a 4th grade class on mirrors.Design a hands on activity using the materialsprovided for your students to learn aboutthe laws of regular and diffused reflection.You might want to use a County Fair themeand make a fun house with different kinds of mirrors.

Choices

• A – Home interior presentation

• B – Teaching a class of Bass Pro Shop on the art of spear fishing

• C – Teaching a 4th grade class on mirrors