Chapter 18 PowerPoint Chapter Review Questions Mrs. Miller 6A light

What do you “think” when you hear the word opaque?

???Answer??? NO WAY!

What do “think” when you hear the word translucent?

???Answer??? SOME!

What do “think” when you hear the word transparent?

???Answer??? ALL!

Name three Kinds of mirrors.

???Answer??? plane convex concave

What carries the signals generated by the rods and cones *TO* your brain?

???Answer??? your optic nerve

Describe the light that a laser produces in ONE word.

???Answer??? coherent

What is the reason that a laser beam can travel through a curled-up optical fiber?

???Answer??? because of total internal reflection

What color would a red tomato appear under a blue light?

???Answer??? The tomato would appear black!

Name 3 things that can occur when light strikes an object.

???Answer??? The light can be: reflected absorbed transmitted

Clear glass, water, and air are examples of what kind of material?

???Answer??? transparent

What happens when light passes from air into water?

???Answer??? The light Slows down

What happens when white light strikes a black object?

???Answer??? no light is reflected

What is the hole through which light enters the eye?

???Answer??? The pupil

What happens when parallel rays of light hit a smooth surface?

???Answer??? regular reflection

What are the primary colors of LIGHT?

???Answer??? Red Green Blue

Are frosted glass and wax paper: transparent translucent or opaque?

???Answer??? translucent

Describe what is happening if a person is nearsighted.

???Answer??? they don’t see well far away their eyeballs are a little too long Nearsightedness

What do we call long, thin strands of glass or plastic that carry light for long distances without allowing the light to fade.

???Answer??? Optical fibers

What do we call the transparent front surface of the eye?

???Answer??? cornea

What do we call an image of a distant object caused by refraction of light?

???Answer??? mirage

What device uses lenses to focus light rays and record an image of an object on photographic film?

???Answer??? camera

Where are the rods and cones located?

???Answer??? On the retina

What occurs when parallel rays of light hit a rough or bumpy surface?

???Answer??? diffuse reflection

What are substances called that are used to color other materials?

???Answer??? pigments

What instrument is used in holography?

???Answer??? A laser

What do any two primary colors of light combined in equal amounts produce?

???Answer??? A secondary color

Name a difference between the refracting telescope and the reflecting telescope.

???Answer??? Refracting telescope - uses lenses Reflecting telescope - uses mirrors

This is located where the optic nerve begins, and it is part of the retina. What is it?

???Answer??? the blind spot

What is an instrument called that uses a combination of lenses to produce enlarged images of tiny objects?

???Answer??? A microscope

What is it called when the surface of a mirror curves inward, like the inside of a bowl?

???Answer??? concave mirror

What instruments uses lenses or mirrors to collect and focus light from distant objects?

???Answer??? telescopes

Because the light rays never meet, a concave lens can produce what kind of image?

???Answer??? only a virtual image

What are the light-sensitive cells of the eye?

???Answer??? Rods and cones

What kind of lenses or mirrors can usually be used to correct farsightedness?

???Answer??? convex lenses

A photographic slide is an example of what?

???Answer??? Color filter

What do we call the bending of light rays as they enter a new medium?

???Answer??? refraction

What do we call a curved piece of glass or other transparent material that is used to refract light?

???Answer??? lens

Why are lasers useful in surgery?

???Answer??? laser incisions usually heal faster than scalpel cuts

What shape is a lens that is thinner in the center than at the edges?

???Answer??? concave

What do we call the colored ring of muscle that controls the size of the pupil?

???Answer??? iris

What do we call the bending of light rays as they enter a new medium?

???Answer??? refraction

What helps the lens relax or contract when focusing on objects nearby or far away?

???Answer??? Ciliary muscles

_________________ is formed where light rays meet at a point.

???Answer??? A real image

A mirage is caused by ____________ as light passes through layers of air at different ________________.

???Answer??? refraction temperatures

What is the colored ring of muscle around the pupil?

???Answer??? iris

A ________ lens is thicker in the center than at its edges.

???Answer??? convex

To focus light, muscles in the eye change the length and thickness of the ____________.

???Answer??? lens

Nearby objects appear blurry to a person who is _____________.

???Answer??? farsightedness

What part of a your eye helps you see in dim light?

???Answer??? The rods

What part of a telescope or microscope magnifies the image?

???Answer??? The eyepiece

What do we call light waves that are in step, or have crests aligned with crests?

???Answer??? coherent

When the three primary colors of PIGMENTS are mixed, what is the resulting color?

???Answer??? black

When you focus on a distant object, what does the lens in your eye do?

???Answer??? The lens becomes longer and thinner

What part of the eye functions only in bright light and responds to color?

???Answer??? The cones

What do we call the point at which light rays meet?

???Answer??? The focal point

What is a hologram?

???Answer??? a three-dimensional photograph

How are signals sent through optical fibers?

???Answer??? The lasers convert electrical signals into pulses of light.

As parallel rays of light pass through a(n)_________ lens, they are bent toward the center of the lens.

???Answer??? convex

Because of refraction, what do glass prisms separate white light into?

???Answer??? a visible spectrum of colors

What does a Material’s Index of Refraction measure?

???Answer??? It measures how much a ray of light BENDS when it enters that material.

________________ occurs when parallel rays of light hit a bumpy, or uneven, surface.

???Answer??? Diffuse reflection

What science chapters will we cover the last Nine Weeks?

???Answer??? Chapter 19 Chapter 20 Chapter 13 Chapter 14

It is A LOT of ink but these slides CAN be printed as flashcards! ??DID YOU KNOW??

What is a color filter?

???Answer??? It is a transparent material that allows certain colors of light to pass through it and reflects or absorbs other colors.

What is the name of the layer of cells lining the inside of the eyeball?

???Answer??? retina

Why is the white back and tail of a skunk appear white and the legs look black?

???Answer??? White – reflects all colors of light Black – absorbs all colors of light

Explain why a pencil in a glass of water appears bent looking at it from the side!

???Answer??? Because the rays that pass through the lens are bent away from the center of the lens and spread out!

What is the Web address of your science text Online?

???Answer? ??

Are you also studying from your comparison *chart* of plane-concave-convex that you made in class?

???Answer??? Yes! It is VERY HELPFUL!

What do you get if you overlap all the primary colors of light? What do you get if you overlap all the primary colors of pigment?

???Answer??? White Black

So, how does a television show the color black?

???Answer??? The TV switches off all the colored lights in the area of the screen that appears black!

What colors are used in the four-color printing process?

???Answer??? Cyan Yellow Magenta Black

Another Web site linked to your textbook is

???Answer??? I like their HOT LINKS And INTERNET ACTIVITIES

The End