2. Check & Reflect p. 186
1. A telescope could be used to view a mountain peak. Binoculars could also be used
2. Both the microscope and refracting telescope use lenses to collect and focus light. The telescope collects small amounts of light from distant objects. The microscope collects light that passes through a small, nearby object. The telescope produces an enlarged image of a distant object. A microscope produces an enlarged image of a small close object
3. Both reflecting and refracting telescopes magnify distant objects. Reflecting telescopes use mirrors to capture light and direct it to a magnifying lens. Retracting telescopes use a combination of lenses to collect and focus light.

3. Assess Your Learning p. 187 2. Light travels in straight lines.
Light can be reflected
Light can bend
Light is a form of energy
3. Yes. An optical device is any technology that uses light. Mirrors use light to form images
4. Telescopes have allowed for amazing astronomical discoveries. Without them, we would not be able to see many of the features of astronomical objects. Without telescopes, many astronomical objects would not of been discovered.

4. Quick Review How is the refracting & reflecting telescopes the same?
Different?
When would you use…
A microscope?
A telescope?
Binoculars?

5. Did you know?
The Hubbles Space Telescope is a telescope in outer space?
It gives more clearer pictures than telescopes on earth because there is no atmosphere!

6. Light Behaves in Predictable Ways
Section 2.1
Light Behaves in Predictable Ways
When is a car not a car? When it turns into a driveway!

7. Don’t Forget…
If you have a protractor…please bring it for next class!

8. IB Question:
How does light interact with different materials? How do we represent this?

9. Copy This Down
Recall Intensity:
Intensity – brightness of light; amount of light arriving per unit area at a place.
A light meter measures the intensity of light
  Further the light source the lower the intensity = fewer rays reach your eyes.
Why? Get blocked or lose energy
Explains how shadows are places where light rays are blocked.
If light hits an object, it can’t go any father
P. 190

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Ray Diagrams
Rays Diagrams – diagram used to represent how light travels; each ray has a straight arrow to show the direction of travel.

11. Light Interacts with Materials
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Transparent – describes materials that allow light to pass through with little or no reflection; Ex) glass.
Translucent – describes materials that allow some light to pass through; Ex) frosted window.
Opaque – describes materials that do not allow light to pass through; Ex) wood, books

12. How would you represent the amount of light that passes through each?

13. Light Interacts with Materials
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Light Interacts with Materials
Non-luminous – describes objects that do not produce light but may reflect it; most objects on earth are non-luminous Ex) wood.
Luminous – describes objects that produce light; Ex) sun & fire

14. Food For Thought… Is the moon luminescent or non-luminescent?
Did you know? Non-luminescent objects reflect the color they do not absorb

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2 Types of Reflection
Regular Reflection – reflection that happens when parallel rays hit a smooth surface; all rays reflect at the same angle.
Your eyes must be in line with the reflected rays to get a clear image.

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2 Types of Reflection
Diffuse Reflection – reflection that happens when parallel rays hit a rough surface; all rays reflect at different angles.
Object can be seen from any position.
I.e. light is scattered like on a kitchen table

17. If it hits a rough surface, the light is scattered.
If it hits a smooth surface, the light reflects at an opposite angle to the angle it hits.

18. Movie Time
The Red Apple
Transparent, translucent, and opaque

19. Copy This Down
Homework!!
Check & Reflect p. 193 1 3 4 5