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2019

Name: ______________________________________ Date: ________________________

Student Exploration: Ray Tracing (Lenses)

Vocabulary: concave lens, convex lens, focal point, image, magnification,

real image, refraction, virtual image

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

Agnes is trapped on a desert island with nothing but a magnifying

glass. She wants to use the glass to focus sunlight and start a fire.

She holds the glass above some dry grass as shown at right.

1. On the diagram, draw the path the Sun rays will likely

take from the magnifying glass to the grass.

2. A magnifying glass is an example of a convex

lens—a lens that curves outward on both sides.

Why is a convex lens useful for starting fires? ____________________________________

_________________________________________________________________________

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.

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 and up and down.

What is always true about the light ray that emerges from the right side of the lens?

_________________________________________________________________________

2. Turn off the Parallel line and turn on the Line through focal point. Move the candle.

What do you notice about this line? _____________________________________________

_________________________________________________________________________

https://gizmos.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=588

Because the lens can direct the light to a point, it

focuses all the light there so that point heats up,

and can catch fire

the line goes towards the focal point

paralell to principle axis

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Ray Tracing Lenses lab-2

Instructional Methods for Secondary School Subjects - Social Science (EDSE 4212S )

California State University Los Angeles

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