Student Exploration: Ray Tracing Part 1(Lenses) SWC- GISMO LATEST UPDATES

SWC 2020 Student Exploration: Ray Tracing Part 1 (Lenses) Learning Objectives Students will …  Learn the difference between real and virtual images.  Describe how changing the position of the object affects the image.  Describe how changing the focal length of the lens affects the image.  Compare and contrast convex and concave lenses.  Derive and apply the thin-lens equation: 1/do + 1/di = 1/f.  Understand how magnification is related to the position of the object and focal point. Vocabulary Please use your note packages and textbook 13.4 pp 666- 683 to define/describe the vocab employed in this lesson: concave lens vs convex lens focal point image magnification diminished image vs enlarged image: inverted image vs erect image real image vs virtual image : Why is a convex lens useful for starting fires? A convex lens is useful for starting fire because it helps focus the sunlight which causes it to focus the energy of the sun to a point where it has enough heat to ignite the grass. Gizmo Warm-up The Ray Tracing (Lenses) Gizmo shows light rays passing through a lens. The light rays are bent by refraction as they pass through the lens and form a focused image to the right of the lens Question: How do lenses create images? Question: How is the position of the image related to the position of the object and the focal length of the lens? Question: What determines the magnification of an image? Summary of the conventions to use with the mirror and lens equations: Examples of converging equipment are _concave__ mirrors and __convex____ lenses. These have ___two____ focal points with a ___positive___ focal length. Examples of diverging equipment are __convex__ mirrors and __concave____lenses. These have ___two______focal points with a _negative__ focal length. Real images have a _positive__ position (di) and __positive_ attitude with a __ positive____ height (hi). Virtual images have a _negative___ position (di) and _positive__ attitude with a_ positive___ height (hi)