2P Optics

Study notes

1. What is Light?

• Light is Energy.

• Light is Wave (Electromagnetic)

• Light is a Particle (Photon)

1. What are the different ways that light is produced

Incandescent

Florescent lightsare more efficient than incandescent

Phosphorescent Light (Glow in the Dark)

Electric Discharge

Bioluminescence

2. What are the two laws of reflection

–The angle of incidence is equal to the angle of reflection

–The incident ray and the reflected ray all lie in the same plane.

3. Light Interactions

• Diffraction: Wave bends around corners

• Dispersion: Light Spreads out (White Light into a RAINBOW)

• Reflection: Light bounces (Angle of Incidence equals Angle of Reflection)

• Refraction: Light slows and bends when it enters a new medium (air Glass)

4. Electromagnetic Spectrum

• Radio Waves

• Microwaves

• Infrared

• Visible

• Ultra Violet

• X ray

• Gamma Ray

5. Colors of the rainbow are inthe Visible Spectrum

• Red

• Orange

• Yellow

• Green

• Blue

• Indigo

• Violet

4a. Primary Colour of Light

• RED

• GREEN

• BLUE

• R+G+B=White

• This is additive because the colors combine to make new colours.

4b. What are the primary colours of paint, pigments and dyes.

• Yellow• Cyan• Magenta

• This is subtractive because red, green and blue light is absorbed. Black is when no light is reflected.

4c. How the Eye Works.

Rods and cones are special cells in your eye that process light. Rods help us see black and white and shades of grey. Cones help us see color.

You have 3 kinds of cones – they process red, green, and blue.

The Colour Wheel for light

Cyan= Blue +GreenMagenta = Red + BlueYellow = Red + GreenWhite = R + G + B

Two Colours that make white light C + R = B + G + R= W (Cyan + Red make White)

also B + Y = W and M + G = W

11. Plane (flat) Mirror

4d. Subtractive Colour Theory

Cyan Pigment absorbs_________Paint appears to be ___________

__________ light,made of R & B _ _______

M

R

B

blue

4d. Subtractive Colour Theory

Blue Filter absorbs ____________ light

Cyan Light is made up of _______ and ______

Yellow (R + G)

B GBlue Light

5.Difference between Luminous and non Luminous

• Luminous Emits it own light (Sun)

• Non Luminous reflects light (moon)

6. SALT

• SIZE

• ATTITUDE

• LOCATION

• TYPE

SALT is used to describe an image.

7. image in a ConcaveMirror when the object is beyond C

VC F

PA

Size: smallAttitude: invertedLocation: in-front Type: real

image in a ConcaveMirror when the object at C

VC F

PA

Size: sameAttitude: invertedLocation: in-front Type: real

image in a ConcaveMirror when the object is

between C and F

VC F

PA

Size: larger Attitude: invertedLocation: in-front Type: real

image in a ConcaveMirror when the object is at F

VC FPA

NO IMAGE!!(Light Rays do not Intersect orAppear to Intersect)

image in a ConcaveMirror when the object

between F and V

VC F

PA

Size: larger Attitude: upright Location: behind Type: virtual

8. Convex (diverging) mirror.

V CFPA

1. Size: smallAttitude: upright Location: behind Type: virtual

2. Name one difference between a convex (diverging) and concave

(converging) mirror.• The difference between a convex and

concave mirror (beside their shapes) is that the concave mirror can produce a real or virtual image and a convex can only produce a virtual.

3. Give one use for a convex mirror.

• Security Mirror

• Makeup mirror

• Etc

4. A convex mirror

• Always produces a Virtual image (located behind “inside” the mirror)

9. Give one kind of optical instruments that contain a lens?

• Glasses

• Camera

• Overhead

• Telescope

• Microscope

• Contact lenses

• etc…

9b. Image in a Converging Lens when the object is beyond C

2F FPA

F

Size: small or same or larger Attitude: upright or invertedLocation: behind or in-front Type: real or virtual

9b. The image in a Diverging Lens

Size: smallAttitude: upright Location: in-front Type: virtual

STUDY HARD

AND

GOOD LUCK ON THE EXAM