A Lighthouse of Lenses Acton-Boxboro Group: Helen, Caitlin, Joanna, Rashmi, Amy, Elizabeth, Maureen, and Laurie

Final Design Why This? How our exhibit works. Different aspects of our exhibit. Issues Lenses around us History behind lenses Science Behind Exhibit Cooperation

Final Design 4 ft x 4 ft space Hexagonal box 4 openings with combs 1 opening to project slides 1 opening for mixing colored light 2 walls Budget of $3,000, spent $531.05

First interested in cameras. Focused on lenses and optics. From that we compiled the idea for a light house.

Lenses on 4 sides –Concave –Convex –Prisms Slides –Different Slides –Wall to project on –Sheet of fresnel lenses and a magnifying glass to flip image

Mixing different colored light -Theatrical Gels -Prisms -Screen

4 sided figure 3 comb sides and 1 slide side Medium, small, large combs Wanted to look like light house

3 sided figure 2 comb sides(sliding combs) 1 slide side Vents on top Dead space

6 sided figure Final design 4 comb sides 1 slide side 1 colored light mixing side Inverted light bulb Looked nice in the area

Darkening Our Exhibit Space too bright First idea- cubicle wall Final- wooden wall 5 ft tall

Issues- Using a 200 watt bulb. Made the wood extremely hot. To cool down: –Open at bottom – Fan at top to draw air out

Glasses are made of two lenses. Your eye is a convex lens. There are fresnel lenses inside a lighthouse to magnify the center light beam.

A magnifying glass is actually a large convex lens. There’s a fresnel lens inside an overhead projector. When you look through a camera you’re looking through a double convex lens.

There are 2 right angle prisms in a periscope which make the light bend 90 degrees directing the top view to the eye. The parallel rays from stars are directed by the concave mirror to the diagonal mirror which reflects the light to the lens in the eyepiece in a reflecting telescope. A refracting telescope has three convex lenses. The first brings the object into focus, but inverts it, the second enlarges it, and the third puts it back right side up.

The first lenses were glass spheres filled with water and were used as burning glasses They were made by the Greeks and Romans True glass lenses weren’t made until the 13 th century in England

A magnifying glass is a convex lens When the object is outside of the focal point (where the rays of light cross), the image will be upside down. This happens with any convex lens, the rays of light converge and cross on the other side of the lens.

A concave lens bends in, meaning the middle is thinner than the outer edges. A concave lens spreads out the rays of light Its focal point (where the virtual image shows up) is on the same side as the source of light

Prisms come in different shapes We have included a rectangle and triangle prism Triangle prisms can create rainbows Triangle prisms are great to direct light at drastic angles. They have been used in our exhibit to cross the different colored light. The degree of each angle is the degree the light is bent. Right angle prisms direct light 90 or 45 degrees and equilateral prisms direct it 60 degrees.

PIGMENT Primary colors-magenta, yellow, cyan (light secondary) Secondary colors- green, blue, red (light primary) LIGHT The primary and secondary colors of light All three colors make white light Different amounts of red, green, and blue create different shades of color blue green red cyan magenta yellow WHITE

We all had lots of fun, but at times our ideas differed with each others’ or with our client. This program turned out to be quite a team experience and we learned a lot about teamwork.

Louise- Without her we’d never be done Janet- Kept us having fun Haruna- Solves our problems (mmmm… cookies) Peter- Turned us into celebrities Geoff and Denise- Made us look like professionals Emily- Web page master Laurie- Earthquake woman(and gave up her time for us) Bob-Turns on the power Kathy Kelly- for helping us get here everyday

THE END Any questions?