Ch. 14 Light, Mirrors, & Lenses

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Presentation transcript:

Ch. 14 Light, Mirrors, & Lenses Sec. 3 Refraction & Lenses

Reminders… the speed of light in empty space is about 300 million m/s light travels slower through mediums (slowest through solids, fastest through gases) Speed of Light Comparison refraction is the bending of light caused by a change in speed as it passes through different mediums

Refraction & Lenses lens - transparent object w/ at least one curved side that causes light to bend/refract more curved = bends light more 2 types: convex & concave

2 Types of Lenses Convex Lens Concave Lens convex lens - thicker in the middle than at edges like a concave mirror… causes light rays to come together/converge distance the object is from the focal point affects image concave lens – thicker at edges than in the middle like a convex mirror… causes light rays to spread out/diverge forms an upright, smaller image

Concave Lens Images always an upright, smaller image

Convex Lens IF the incoming light is parallel to the optical axis, all the light rays passing through a convex lens pass through the focal point (distance from this point to the center of the lens is called the focal length)

Convex Lens Images IF an object is farther than 2 focal lengths from a convex lens… the image will be upside down (inverted) & smaller IF an object is b/w one & 2 focal lengths from a convex lens… (inverted) & larger IF an object is closer than one focal length to a convex lens… the image will be upright & larger (like a magnifying glass)