Reflecting both the NGSS and NSES standards, this lesson from the Essential Science series covers the following key concepts:

• Light sources can be natural or artificial.

• Light travels in a straight line until it strikes an object.

• Light can be reflected by shiny materials (like a mirror).

• Light can be refracted by curved surfaces (like lenses).

• Light can be absorbed, producing heat.

Note that every lesson in this series also offers multiple options for “hands-on” activities, and alternative assessments of varying difficulty.