Refraction with Concave and Convex Lenses

Project Description

Refraction and Lenses

One of the ways we manipulate light to make it do what we want to do is by using lenses to change the direction of light via refraction. This is some background information for you, the teacher. Allow students to explore the materials, using worksheets for guidance, and then hold a classroom discussion to highlight the main learning points.

Download the Lesson and Templatet

Grades: 1 to 5
Duration: 1/2 Hour – 1 Hour

Supplies: A set of 3 LightBLOX with the slit caps on, 3 Lenses – concave, convex, trapezoid OR Tech Light Lab

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Tech Light Lab

Tech Light Lab

Light Blox

Light Blox

Refraction with convex lens and light blox

Refraction Through a Lens

One of the ways we manipulate light to make it do what we want to do is by using lenses to change the direction of light. This is some background information for you, the teacher. Allow students to explore the materials, using worksheets for guidance, and then hold a classroom discussion to highlight the main learning points.

Convex Lenses

A convex lens is thicker in the middle than at the ends and causes light to bend towards “normal”, or the center of the lens. As three rays of light pass into and through the convex lens, you can see that they all converge to a point – that point is called the focal point. This focusing ability of convex lenses helps us to see images clearly – from the lenses in our eyes to the lenses in microscopes and telescopes

Concave Lenses

A concave lens on the other hand, is thinner in the middle than at the ends, and causes light to bend away from “normal”, or the center of the lens. As three rays pass through the concave lens, you can see that they diverge, or spread out.

Activity Step 1: Refraction with a Concave Lens

Turn on ALL THREE Light Blox. Using the template page, set up three Light Blox and the CONCAVE lens as directed. On the template page (download the lesson with Template Page), draw the beams that pass through the lens. Describe what happens to the light beams as they pass through the CONCAVE Lens.

Describe what happens to the light beams as they pass (refract) through the CONCAVE Lens

Activity Step 2: Refraction with a Convex lens

Now use the template page (download the lesson with Template Page) to set up three Light Blox and the CONVEX lens as directed. On the template page, draw the beams that pass through the lens. Describe what happens to the light beams as they pass through the CONVEX lens.

Describe what happens to the light beams as they pass through the CONVEX lens.

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