Lenses
Eyes
Seeing Color
Random/Vocabulary
Mirrors and lenses
100
True or false, a lens does not have to have a curved side.
What is false. A lens has to have AT LEAST one curved side or it would be considered just a piece of glass.
100

What is the pupil and what does it do? 

The pupil is the opening in the center of the eye and it allows light to pass into the eye through the lens to be focused on the retina so you can see. 

100
Give two examples of an opaque object.
What is wood and a brick wall etc.
100
With a higher frequency, comes a _________ wavelength
What is shorter wavelength.
100

What is a plane mirror? Give an example. 

A smooth surface that makes a virtual image that is reversed. Example: bathroom mirror. 

200
Draw the difference in light refraction between a concave lens and a convex lens.
What is concave caves in and refracts light to spread it out. Concave refracts light to help see close up.
200

What is the function of the Iris? 

Its a circular muscle that contracts to let less light in, or relaxes to let more light in the eye. 

200
What is the difference between translucent and transparent? Give an example of each.
What is transparent objects let most light pass through clearly and example would be a window. Translucent objects scatter light that passes through it an example would be wax paper.
200
What are contact lenses, concave or convex and why are they beneficial?
What is they can be either concave or convex lenses. They are beneficial because they sit so close to your eye which allows them to be thin and bendable.
200

What is a concave mirror. How does it work? 

Its a mirror that is in the shape of a bowl. It can produce real or virtual images based on the distance to the object. It can magnify or reduce the image as well. 
300

Which lens would contain a REAL focal point?

What is convex lens.

300

What is the function of the cornea? 

It is a clear protective layer that lies over the iris and pupil. It protects the eye from damage. 

300
Explain what happens when light hits opaque, translucent, and transparent objects.
What is if light hits an opaque object, most light is absorbed, changed to heat, and some is reflected but light does not pass through. Translucent- light hits the object, some is absorbed, most is scattered but passes through the object. Transparent- light hits the object, little is absorbed and all light can pass through.
300
Explain how a prism works.
What is white light is refracted through the glass which bends the light slowing it down to produce visible light. **Water is a natural prism**
300

What is a convex mirror and how does it work? 

Shaped like a backwards bowl. It produces smaller and virtual images. 

400

What is the difference between far sightedness and near sightedness? Which lens would be used for each?

What is far sightedness people can see objects that are far away but not close up. This is corrected with a convex lens which refracts the light to a focal point. Near sightedness means you can see close up and not far away. This is corrected with a concave lends which refracts the light to spread it out.

400

What is the function of the retina and what are the differences between rods and cones? 

The retina is the light sensitive part of the eye composed of rod and cone cells. Rods pick up light and dark, cones pick up red, blue, and green light. 

400
What are the three primary colors and why are they used so often?
What is green, red, and blue. They are used so often because when mixed they produce many different colors. When all three are mixed together they produce white light.
400

Explain what filters are in terms of light.

What is filters absorb some colors of light and let other pass through to change colors. They are used in plays, concerts, etc.

400

Draw a convex lens. Explain how it works. 

converges light. 

500

What type of lens does the eye use? 

A convex lens. It focuses the light on the retina. :)

500

What are cataracts and how do they affect the eye and vision? 

Cataracts are blurry spots that appear on the cornea through damage, age, or drug use. they cause vision to be distorted as they stop light from entering the eye. 

500
Why do we see objects are certain colors? For example, why is a red apple, red?
What is because when light strikes an object, some colors are absorbed and some are reflected. We see a red apple as red because all other colors are absorbed and red is reflected.
500
What would frosted glass be an example of?
What is translucent object because the light passes through but is scattered.
500

draw a concave lens, explain how it works. 

diverges light

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