Reflection & Mirrors - PowerPoint PPT Presentation

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Reflection & Mirrors. Recap:. Diffuse reflection: gives a blurry image (or none at all). Specular reflection: gives a clear image. Mirror types: PLANECONVEXCONCAVE . Plane Mirrors. The image formed by plane mirrors can only be seen behind the mirror.

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Reflection & Mirrors

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Reflection & Mirrors

Recap:

Diffuse reflection: gives a blurry image (or none at all)

Specular reflection: gives a clear image

Mirror types:

PLANECONVEXCONCAVE

Plane Mirrors

• The image formed by plane mirrors can only be seen behind the mirror.

• This is known as a virtual image.

• Image is the same size as the object.

• Only the right and left of the image is changed.

Curved mirrors can be either

concave (making a little cave) – Causes light to converge

convex (vexing out in the middle) – Causes light to diverge

Ray Diagrams

• Show path of light from object  mirror  away from mirror

• Allows you to determine the location and properties of an image formed by a mirror or lens

Ray Diagram: Basic set-up

mirror

r

f

(focal length)

Principal axis

C

(center of curvature)

F

(focal point)

** r = 2f

Ray Diagrams: images

• REAL vs. VIRTUAL

• UPRIGHT vs. INVERTED

• SAME SIZE, SMALLER, ENLARGED

COMPARE IMAGE TO ORIGINAL OBJECT

Real or Virtual

Real images can project on a screen

Virtual images can only

be seen in a mirror

Upright or Inverted

Upright images are oriented the same as the object

Inverted images are oriented in the opposite direction as the object

Reduced or Enlarged

Reduced images are smaller in size than the object

Enlarged images are larger in size than the object

• Take 2 different colored pencils

• Take a slice of index card/Ruler

• This will be your straight-edge

• PUT YOUR NAME ON IT & KEEP IT

• Decorate it if you want to

• Take a notes packet

Concave Mirror A

Step 1: draw horizontal ray from top of object to mirror

Step 2: draw reflected ray from point where ray hits mirror through focal point

Step 3: draw second ray from top of object through focal point to mirror

Step 4: draw reflected ray from point where ray hits mirror horizontally back

Step 5: draw image from principal axis to intersection of reflected rays

F

Image is:

REAL

INVERTED

LARGER

FARTHER

Concave Mirror B

Step 1: draw horizontal ray from top of object to mirror

Step 2: draw reflected ray through focal point

Step 3: draw second ray from focal point, through top of object, to mirror

Step 4: draw horizontal reflected ray

Step 5: continue both reflected rays behind mirror as DASHED LINES

Step 6: draw image from principal axis to intersection of reflected rays

F

Image is:

VIRTUAL

UPRIGHT

LARGER

FARTHER

Convex Mirror

Step 1: draw horizontal ray from top of object to mirror

Step 2: draw reflected ray from focal point through point where ray hit mirror and out

Step 3: draw angled ray, aimed at focal point, to mirror

Step 4: draw horizontal reflected ray

Step 5: continue both reflected rays behind mirror as DASHED LINES

Step 6: draw image from principal axis to intersection of reflected rays

F

Image is:

VIRTUAL

UPRIGHT

SMALLER

CLOSER

• Questions?

• Begin optics packet!