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CH 14: MIRRORS & LENSES 14.1: Mirrors. I. Plane Mirrors  Flat, smooth mirror  Creates a virtual image: an image your brain perceives even though no.

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Presentation on theme: "CH 14: MIRRORS & LENSES 14.1: Mirrors. I. Plane Mirrors  Flat, smooth mirror  Creates a virtual image: an image your brain perceives even though no."— Presentation transcript:

1 CH 14: MIRRORS & LENSES 14.1: Mirrors

2 I. Plane Mirrors  Flat, smooth mirror  Creates a virtual image: an image your brain perceives even though no light rays pass through it.  Image appears upright and as far behind the mirror as the object is in front of it (same size as object).

3 How your brain sees it…  Your brain always interprets light rays as if they have traveled in a straight line.  It doesn’t realize the rays have reflected and changed direction.

4 Terms to Know  focal point: point on the optical axis of a concave mirror or convex lens through which light rays traveling parallel to the optical axis pass after striking the mirror or lens  optical axis: imaginary straight line perpendicular to the center of a concave mirror or convex lens  focal length: distance from the center of a mirror or lens to the focal point

5 II. Concave Mirrors  Mirror whose surface curves inward  Light rays converge (come together)

6 How Concave Mirrors Form Images  The image formed by a concave mirror depends on the object’s location relative to the focal point.  Concave mirrors can form real images: rays of light actually pass through the location of the image “projects” an image Occurs when object is past the focal point: Image of an object more than 2 focal lengths is real, upside down, and smaller than the object. Image of an object between 1 and 2 focal lengths is real, inverted, and larger than the object.

7  Concave mirrors will form NO IMAGE when the object is held at the focal point.  Concave mirrors will form virtual images when objects are between the focal point and the mirror. Virtual image is upright and larger than the object (i.e. magnifying mirrors)

8 III. Convex Mirrors  Mirror whose surface curves outward  Light rays diverge (spread apart) after reflection  wide “field of view”  Forms a virtual image that is smaller than the actual image and is always upright.  Examples: back of a spoon, security mirrors at corners  “objects in mirror are closer than they appear”


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