Student Exploration: Ray Tracing (Lenses)

2019Name: ____Sarmeen Malek_________________________ Date: _ June_2 2020__Student Exploration: Ray Tracing (Lenses)Vocabulary : concave lens, convex lens, focal point,image, magnification, real image, refraction, virtualimage Prior Knowledge Questions (Do these BEFOREusing the Gizmo.)Agnes is trapped on a desert island with nothing buta magnifying glass. She wants to use the glass tofocus sunlight and start a fire. She holds the glassabove some dry grass as shown at right.1. On the diagram, draw the path the Sun rays willlikely take from the magnifying glass to thegrass.2. A magnifying glass is an example of a convex lensa lens that curves outward on both sides. Why is a convex lens useful for starting fires? _____________________________________________________________________________________________________________Gizmo Warm-upThe Ray Tracing (Lenses) Gizmo shows light rays passing through a lens. The light rays are bent by refraction as theypass through the lens and form a focused image to the rightof the lens. To begin, turn on the Colorize lines checkbox. Under Show lines , turn off the Central line and the Line through focal point so that only the Parallel line is showing.1. The blue dots in front of and behind the lens are the focal points of the lens. Move the candle on the left back and forth