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Name_____________________________Date____Period___ Lenses form images by refracting light A medium can refract light Define refract IYOW: Refraction occurs because IYOW: Refraction of light Direction in which a light wave turns depends on: Denser medium will: Thinner medium will: Define the normal- If the medium slows the wave If the medium lets the wave speed up Refraction and Rainbows Rainbows are cause by: Shape determines how lenses form images Flat mediums- A lens is a clear optical tool that refracts light- non flat mediums. Types of lenses Convex vs. Concave Convex Concave Shape of lens How are parallel light rays refracted? Rays meet at focal point? How many times do they refract? What rays are refracted the most? Which rays will not refract at all? Images Formed by Lenses Type of image depends on 1. 2. For convex lenses Convex lens: Distance from lens is measured in focal length, which is- How a Convex Lens Forms Images Summarize the three steps for how a convex lens forms images. 1. ___________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ 2. ___________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ 3. ___________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ Image appearance based on focal length Focal Length Size of image compared to object Upside-down? (Circle one) 2+ y/n 1-2 y/n <1 y/n Concave Lenses Size of image compared to object Upsidedown? (Circle one) Is this always the case? (Circle one) Does focal length make a difference?(Circle one) y/n y/n y/n Questions: 1. What quality of a material affects how much it refracts light? 2. How does the curve in a lens cause it to refract light differently from a flat piece of glass? 3. How does a camera lens form an image? 4. You look through a lens and see in image of a building upside down. What type of lens are you looking through? 5. Draw the path of a light ray moving at an angle from air into water. Write a caption to explain the process. 6. Study the diagram on page 602. Describe the light rays that would pass through the labeled focal point. Where are they coming from and how are they related to each other?
