Images on a plane mirror
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Images on a Plane Mirror. Using Light Rays to Locate an Image. Light rays and the laws of reflection help determine how and where an image is formed in a plane mirror. REFLECTION is the bouncing back of light rays from a surface. We all know that light travels in a straight line.

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Images on a Plane Mirror

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Images on a plane mirror

Images on a Plane Mirror


Using light rays to locate an image

Using Light Rays to Locate an Image

  • Light rays and the laws of reflection help determine how and where an image is formed in a plane mirror.

  • REFLECTION is the bouncing back of light rays from a surface.


Images on a plane mirror

  • We all know that light travels in a straight line.

  • When your eyes detect reflected light from plane mirrors, your brain projects the light rays back in a straight line.


Images on a plane mirror

same

angle

  • Laws of Reflection- Review

  • When a light ray is incident upon reflection surface, the angle of reflection is equal to the angle of incidence.

  • Both angles are measured relative to the normal.

  • The incident ray, reflected ray and normal all lie in the SAME plane.

Normal

Reflected ray

Incident ray


Types of images

Types of Images

  • Real Images- mirrors can produce images that can be projected on a screen. A real image is ALWAYS inverted and appears in front of the mirror.


Images on a plane mirror

  • Virtual Image- mirrors can also produce images that cannot be projected on a screen. A virtual image is ALWAYS upright and appears behind the mirror.


Types of mirrors

Types of Mirrors

  • Plane Mirror- a flat mirror that reflects light rays in the same way that they approach the mirror.

  • Concave Mirror- a converging mirror where light rays that strike the mirror surface are reflected so they converge or “come together”, at a point.


Images on a plane mirror

3. Convex Mirrors- a diverging mirror where light rays that strike the mirror surface are reflected so that they diverge, or “go apart” and they never come to a point.


S a l t

S.A.L.T

  • SALT is used to describe images formed by mirrors.

  • S- Size: compared to original object is it same size, smaller or bigger?

  • A- Attitude: which way the image is oriented compared to the original object (upright or inverted).

  • L- Location: location of the image (in front or behind the mirror).

  • T- Type: is the image a real image or virtual image?


Plane mirrors

PLANE MIRRORS

  • Characteristics of a plane mirror image:

    • Object size= Image Size

    • Object distance from mirror= image distance from mirror

    • Attitude (orientation) is ALWAYS upright

    • ALWAYS forms a virtual image

    • Image is reversed- left to right


Images on a plane mirror

  • The image in a plane mirror appears to be backwards compared to how we view the object directly.

  • This is why the word on the front of an AMBULANCE is written backwards- so it can be read when seen in a rear-view mirror.

AMBULANCE


Images on a plane mirror

  • Mirrors


Steps for drawing plane mirror ray diagrams

Steps for drawing Plane Mirror Ray Diagrams:

  • 1. A ray that strikes perpendicular to the mirror surface, reflects perpendicular to the mirror. Thereflected ray is extended beyond the mirror.

  • 2. A ray that strikes the mirror at any angle reflects so the angle of incidence equals the angle of reflection. The reflected ray is extended beyond the mirror.


Images on a plane mirror

Ray Diagram Using 2 Points:

Perpendicular ray

Reflected

ray

Incident ray


Images on a plane mirror

  • Example:

    • Let’s draw the letter P together on the board

      P?


Lets practice

Lets Practice!!

  • Using the handout provided, draw these 2 images using the principles of reflection off a PLANE MIRROR.

  • Use at least 3 points off of the object.


Images on a plane mirror

HOMEWORK:

P. 493 #1-4,6, 7 and 11


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