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Seeing Things Plane Mirror Image Characteristics. Image Characteristics. Try printing your name on a piece of paper so that it can be easily read in a mirror. If you use the inversion of your name as the object, the image will again be flipped back so that it is easily read in the mirror . .

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slide2

Image Characteristics

Try printing your name on a piece of paper so that it can be easily read in a mirror.

slide3

If you use the inversion of your name as the object, the image will again be flipped back so that it is easily read in the mirror.

slide4

Looking from the Side

The distance of points on the object to the mirror is the same as that of corresponding points on the image to the mirror.

The object and image appear to be flipped or folded about the mirror.

slide5

There is a more useful way of thinking about the image inversions. When the object is between the Eye-Brain and the mirror,

the front edge of the object is flipped to the back edge of the image……..

slide6

There is a more useful way of thinking about the Image inversions. When the object is between the Eye-Brain and the mirror,

the front edge of the object is flipped to the back edge of the image

and the back edge of the object……..

slide7

There is a more useful way of thinking about the image inversions. When the object is between the Eye-Brain and the mirror,

the front edge of the object is flipped to the back edge of the image

and the back edge of the object is flipped to the front edge of the image.

This is called Front-BackInversion.

slide8

In a mirror, the object of a right hand and its image both point to the right.

Therefore, the image does not reverse left and right.

slide9

In a mirror, the object of a right hand’s thumb and its image both point up.

Therefore, the image does not reverse up to down.

slide10

In a mirror, the object of a right hand pointing in results in an image pointing out.

Therefore, the image does change In to Out, or Front to Back.

ambulance
AMBULANCE

OBJECT IMAGE

In a plane mirror, RIGHT is changed to LEFT

by changing IN into OUT.

slide13

Finally, the image in a plane mirror is called VIRTUAL.

We usually see things because rays of light go from what we are looking at straight into our eyes.

This applies to real objects as well.

slide14

Images.

When light rays enter the Eye-Brain, it cannot tell where they actually come from.

slide15

Images

When light rays enter the Eye-Brain, it cannot tell where they actually come from.

The image only appears to be behind the mirror because of the way light reflects off the mirror.

slide16

A plain mirror can be treated like a window.

The image is seen through this “window”.

slide17

Of course, mirrors are not windows. Mirrors are opaque. The only light rays that exist are those that reflect off the mirror.

This is why images in plane mirrors are called VIRTUAL.

slide18

Review

  • Images in plane mirrors have the following characteristics:
  • They are the same size as the object.
  • They are Inverted Front to Back which makes them appear to be left/right or top/bottom inverted.
  • They are located an equal distance from the mirror as the object is and the line connecting the object and image intersects the mirror at 90 °.
  • They are virtual.
slide19

Review in Table Form

SILT - Image Characteristics Review Table

slide20

REMEMBER SILT (OR SALT)

Inversion/Attitude

slide21

REMEMBER SILT (OR SALT)

  • We use 4 main characteristics to describe an image.

Size of an image compared to the object (Ex. Same Size, Smaller, Larger)

slide22

REMEMBER SILT (OR SALT)

Inversion (Attitude) of Image

– which way the image is oriented compared to the object: Upright or Inverted (Upside down)

Inversion/Attitude

slide23

REMEMBER SILT (OR SALT)

Location of Image

-in front/behind a mirror or lens

-distance from mirror or lens compared to object distance

slide24

REMEMBER SILT (OR SALT)

Type of Image (Real or Virtual)

– Real being an image formed when light is actually arriving at the image location (Think of movie projectors).

-Virtual being something that looks beyond the mirror (Think of when you see your reflection).

slide26

Does a candle have to be in front of a mirror in order to form an image?

Both candles can form images. The “mirror” must be extended to find the location of the image for candle #2.

It is there, but how must you look?

slide27

Can all Eye-Brain observers see all images??

    • a) Show where the images are located.
slide28

Show where the images are located.

    • Both candles can form an image. The mirror must be extended to find the location of image #2.
slide29

i. Which Eye-Brain can see the image of candle #1?

C) D) & E) can see image #1. The mirror acts like a window. A straight line must exist between the Eye-Brain and image through the mirror.

slide30

ii. Which Eye-Brain can see the image of candle #2?

A) B) C) & D) can see image #2. The mirror acts like a window. A straight line must exist between the Eye-Brain and image through the mirror.

slide31

What determines whether an Eye-Brain observer can see an image or not?

Mirrors act like windows. A straight line through the mirror must exist between the Eye-Brain and image.

Use the Applet described in the notes to review further.

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