Chapter 7 Light and Geometric Optics

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Presentation transcript:

Chapter 7 Light and Geometric Optics

7.2 Curved Mirrors

Types of Curved Mirrors The images of CURVED MIRRORS are much different than what you are used to from a “regular,” plane mirrors Curved mirrors can be used to form images that are larger or smaller than the object.

Types of Curved Mirrors The images of CURVED MIRRORS are much different than what you are used to from a “regular,” plane mirrors Curved mirrors can be used to form images that are larger or smaller than the object. Concave Mirrors Convex Mirrors

Types of Curved Mirrors Concave Mirrors Used whenever a magnified image of an object is needed They can also produce inverted, small images They produce “real images” Real image = an image that can be projected onto a screen

Types of Curved Mirrors The opposite of Concave Mirrors They curve outwards in the opposite direction of Concave Mirrors Produce smaller images A wider angle of view Always produce virtual images Convex Mirrors

Concave (Converging) Mirrors Imaginary line drawn through the vertex (V) Perpendicular to the surface of the mirror Single Point through which rays parallel to PA will reflect The distance between the Vertex and the Focal Point

Concave (Converging) Mirrors Represents the centre of the sphere from which the curved mirror was cut Represents the distance from the centre of curvature to the mirror surface

Where Will an Image Form? Ray 1 and Ray 2 = follow the Law of Reflection Ray 3 = any ray travelling through F to the V will be reflected right back

Where Will an Image Form? Step #1: Draw a ray from the top and bottom of an object parallel to the PA. Its reflection from the mirror must pass through the F f = R/2

Where Will an Image Form? Step#2: Draw a ray from the top and bottom of an object that passes through the F Its reflection from the mirror must be parallel to the PA. All rays MUST CONVERGE at the Focal Point (F)

Where Will an Image Form? Step#2: Draw a ray from the top and bottom of an object that passes through the F Its reflection from the mirror must be parallel to the PA. All rays MUST CONVERGE at the Focal Point (F)

Characteristics of the Image TYPE: real ATTITUDE: inverted MAGNIFICATION: smaller than the object POSITION: Closer to the mirror

Characteristics of the Image TYPE: real ATTITUDE: inverted MAGNIFICATION: smaller than the object POSITION: Closer to the mirror, between C and F

real inverted smaller than the object Between C and F real inverted Same size as the object At C real inverted larger than the object To the left of C

The Concave Mirror as a Magnifier When the object is between F and the mirror TYPE: virtual ATTITUDE: upright MAGNIFICATION: larger than the object POSITION: behind the mirror

Can You Predict The Location Of An Image Formed By A Concave Mirror? The Mirror Equation Can You Predict The Location Of An Image Formed By A Concave Mirror?

A concave spherical mirror has a focal length of 10. 0 cm A concave spherical mirror has a focal length of 10.0 cm. Locate the image of a pencil that is placed upright 30.0 cm from the mirror. Draw a ray diagram to confirm your answer.

Practice Problems 7.2.1 (all)