SNC 2D Optics Test Review Page 1 of 10

SNC 2D Optics Test Review!!! Page 1 of 13 TEST DATE: ______

STUDY SESSIONS!!!

DATE: TIME: TOPICS:

LIGHT AND THE ELECTROMAGNETIC SPECTRUM (Pg. 384-385)

1) Write the electromagnetic waves in order from lowest energy to highest energy: infrared light, X-rays, red light, gamma rays, and microwaves

2) Sunscreen, if used properly, can protect you from getting a sunburn. From which electromagnetic waves must sunscreen protect the skin?

3) List the seven colours that Newton identified in the visible spectrum of white light.

4) List some devices that you have used or plan to use today that involve electromagnetic waves.

5) Match each electromagnetic wave from column A with the term from column B that is most closely related: COLUMN A COLUMN B X- rays vitamin D ultraviolet light telecommunications radio waves cancer treatment infrared light radar microwaves theatre/concert effects gamma rays baggage screening visible light DVD player remote control

6) Briefly describe how you could demonstrate that white light is composed of many different colours.

SOURCES OF LIGHT (Pg. 393)

1) Why is an incandescent bulb a very inefficient light source?

2) Name the process of producing light by passing an electric current though a gas.

3) State several reasons why living organisms might use bioluminescence.

4) What are two differences between LEDs and incandescent bulbs?

5) LEDs are considered an even better alternative to CFLs to replace incandescent bulbs. Compare CFLs with LEDs. Are LEDs a better alternative? Be sure to consider environmental, health, and economic factors.

RAY MODEL OF LIGHT (Pg. 402  ) SNC 2D Optics Test Review!!! Page 2 of 13 1) Draw a simple ray diagram of light rays travelling out from a light bulb.

2) What three things can happen with light strikes an object?

3) Use a labeled ray diagram to show the difference between transparent, translucent, and opaque objects.

4) Classify each of these materials as transparent, translucent, or opaque: a textbook, frosted glass, a single sheet of thin tissue paper, a clean sheet of glass, a rock, clean air, apple juice, sunglasses.

5) Explain why a piece of metal would make a better reflector than a piece of wood.

6) Under what conditions can a transparent material become translucent or even opaque?

LAWS OF REFLECTION AND PLANE MIRRORS (Pg. 418  )

1) In your own words, clearly distinguish between the terms normal, angle of incidence, and angle of reflection

2) Using a diagram, distinguish between the incident ray, the reflected ray, and the normal.

3) Clearly state the two laws of reflection.

4) a) What would be the angle of reflection for an angle of incidence of 32o? b) What would be the angle of incidence for an angle of reflection of 47o? c) What would the angle of reflection be if the incident ray was 40o from the reflecting mirror surface?

5) Specular reflection and diffuse reflection are concepts that can be applied to every room that you have ever been in. Describe how these concepts can be applied to your kitchen, bathroom, and bedroom.

6) Draw a ray diagram and locate the virtual image of each object: SNC 2D Optics Test Review!!! Page 3 of 13

CONCAVE MIRRORS (Pg. 421,426, 429)

Concave Mirrors Worksheet (attached)

1) List examples of how concave mirrors might be used at your school.

2) Describe the difference between a real image and a virtual image.

3) Use a diagram to locate the focus in a concave mirror.

4) In your own words, state the imaging rules for concave mirrors.

5) You are looking at your image in a makeup or shaving mirror. Where is your head located with respect to the focus (F).

CONVEX MIRRORS

Convex mirrors worksheet (attached)

1) List examples of how convex mirrors might be used at your school. SNC 2D Optics Test Review!!! Page 4 of 13 2) Why will a diverging (convex) mirror never produce a real image? Include a diagram in your explanation.

3) What is the relationship between type and the attitude of an image?

4) a) Why are convex mirrors placed on sharp turns in parking garages? b) State other uses for convex mirrors.

INDEX OF REFRACTION (Pg. 437-438) AND SNELL’S LAW (Pg. 441-442)

1) The speed of light in leaded glass is 1.66x108m/s. What is the index of refraction of this type of glass?

2) The speed of light in quartz is 2.1x108m/s. What is the index of refraction of quartz?

3) The speed of light through a material is 1.24x108m/s. What material is it?

4) What is the speed of light through ethyl alcohol (n=1.36)?

5) What is the speed of light through vegetable oil (n=1.47)?

6) What is the speed of light through a diamond (n=2.42)?

7) When light passes from air into water at an angle of 30o from the normal, what is the angle of refraction?

8) When light passes from water into a diamond at an angle of 45o from the normal, what is the angle of refraction?

9) The refractive index of the lens in a human eye s 1.41. If a ray of light goes from the air into the lens at an angle of 55.0 o, what is the angle of refraction?

10) A ray of light approaches a jar of honey at an angle of 30.0o. If the angle of refraction is 19.5o, what is the refractive index of honey?

11) A block of amber is placed in water and a laser beam travels from the water through the amber. The angle of incidence is 35o while the angle of refraction is 24o. What is the index of refraction of amber?

12) A red laser beam travels from Plexiglass into lemon oil. The angle of incidence is 40.0o and the angle of refraction is 44.4o. What is the refractive index of lemon oil?

CONVERGING AND DIVERGING LENSES (Pg. 450  ) SNC 2D Optics Test Review!!! Page 5 of 13 1) What is the difference between a converging lens and a diverging lens? Mention the paths of light rays in your explanation.

2) Can a converging lens have more than one focus? Explain.

3) You are given two lenses, a converging lens and a diverging lens. Can you tell them apart just by feeling their shape? Explain.

4) a) On what side of a converging lens is the principal focus located? Explain. b) Where is the principal focus of a diverging lens located? c) Why is a diverging lens different from a converging lens?

IMAGES IN LENSES (Pg. 451  )

Lens Ray Diagrams Worksheet (attached)

1) a) In your own words, state the imaging rules for converging lenses. b) How are these rules slightly different for diverging lenses?

2) Why does a diverging lens never produce a real image?

3) How is the virtual image produced by a converging lens different from the virtual image produced by a diverging lens?

4) Write a general statement that is valid for both kinds of lenses that summarizes the relationship between the type and the attitude of the image.

5) When you watch a movie projected onto a screen, you are seeing an image. Traditional-style movie projectors include a light and a lens to project the picture onto the screen. a) What type of lens is used in the projector? Explain. b) Draw a ray diagram that includes the film (the object), the lens, and the image on the screen. c) Describe the characteristics of this image.

THIN LENS EQUATION (Pg. 455-457 )

1. An object 25 cm away from a lens produces a focused image on a film 15 cm away. What is the focal length of the converging lens? 2. If the focal length of the lens in your camera is 2 cm, at what distance must objects be placed so that a focused image is produced on a piece of film set 3 cm from the lens? 3. A tree 20 m high is located 40 m from the converging lens of focal length 8.0 cm. (a) Calculate the distance from the lens to the image. SNC 2D Optics Test Review!!! Page 6 of 13 (b) Calculate the magnification. (c) Calculate the height of the image of the tree.

4. A normal human eye has a focal length of about 2.3 cm. If you look at the tip of a pencil, 55.3 cm from your eye, how far is the image from the lens of your eye?

5. A converging lens produces an image twice the size of the original. (a) If the object is placed 40 cm from the lens, where is the image produced? (b) What is the focal length of the lens? (c) If the image is 6 cm tall, how tall is the original object?

HUMAN EYE (Pg. 470  )

1) Describe at least three similarities between a camera and the human eye.

2) What is meant by, “we actually see with our brain”?

3) What parts of the eye are responsible for viewing objects?

4) Which part of the eye does the “fine tuning” when it comes to viewing an image? How is this accomplished? What is this called and what structures are involved?

5) When an image is produced on the retina of the eye, it is inverted. Why do we not see everything in our view upside down?

HUMAN EYE- VISION PROBLEMS (Pg. 473  )

1) a) What is the difference between far-sightedness and near-sightedness? b) What simple lens shape would correct each of these problems?

2) a) People often require reading glasses as they get older. What vision problem do these people actually have, and what causes it? b) Which corrective lens shape corrects this problem, a positive meniscus or a negative meniscus? Explain.

3) Glasses were used to start fire in Lord of the Flies. Would eyeglasses to correct near-sightedness be able to do this? Explain. SNC 2D Optics Test Review!!! Page 7 of 13 CONCAVE MIRRORS WORKSHEET SNC2D Name______a) Draw a ray diagram for each to locate the image. b) State the characteristics (SALT). *note- diagrams are not to scale SNC 2D Optics Test Review!!! Page 8 of 13 SNC 2D Optics Test Review!!! Page 9 of 13 SNC 2D Optics Test Review!!! Page 10 of 13 CONVEX MIRRORS WORKSHEET SNC2D Name______a) Draw a ray diagram for each to locate the image. b) State the characteristics (SALT). *note- diagrams are not to scale S A L T: 1)

SNC 2D Optics Test Review!!! Page 11 of 13 LENSE RAY DIAGRAMS WORKSHEET SNC2D Name______a) Draw a ray diagram for each to locate the image. b) State the characteristics (SALT). *note- diagrams are not to scale S A L T: 1)

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