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# Images on a Plane Mirror - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Images on a Plane Mirror ' - lovie

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Presentation Transcript

### Images on a Plane Mirror

• 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.

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

• 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.

• 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.

• 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.

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.

• 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?

• 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

AMBULANCE

• Mirrors to how we view the object directly.

Steps for drawing Plane Mirror Ray Diagrams: to how we view the object directly.

• 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.

Ray Diagram Using 2 Points: to how we view the object directly.

Perpendicular ray

Reflected

ray

Incident ray

• Example: to how we view the object directly.

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

P?

Lets Practice!! to how we view the object directly.

• 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.

HOMEWORK: to how we view the object directly.

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