Hands-On Optics Inquiry-based activities Collaboration –International Society for Optical Engineering –Optical Society of America –National Optical Astronomy Observatory –National Science Foundation http://www.hands-on-optics.org
Simple Magnifiers Materials –Thinner lens –Thicker lens –Astronomy picture Always handle lenses by edges Handout for reference
Simple Magnifiers 1.Hold a lens about an inch away from picture. 2.Move lens toward and away from picture. 3.Try it with the other type of lens.
Simple Magnifiers Which lens magnifies more? At what distance does magnification cease?
Simple Magnifiers Which lens magnifies more? At what distance does magnification cease? Thinner lens – 20 cm focal length Thicker lens – 7.5 cm focal length
Build a Refracting Telescope I Materials –Thinner lens (20 cm focal length) –Thicker lens (7.5 cm focal length) Always handle lenses by edges Handout for reference
Build a Refracting Telescope I 1.Hold the thinner lens in front of the thicker lens and examine a distant object. 2.Now try the thicker lens in front of the thinner lens. (This can be difficult.)
Build a Refracting Telescope III Materials –Cardboard tubes (inner and outer) –Plastic bag of optics Large lens Cardboard washer Cap Small lens Foam eyepiece holder Cardboard spacer Always handle lenses by edges Handout for reference
Build a Refracting Telescope III 1.Put curved side of large lens against end of outer tube. Add washer and cap. 2.Push small lens into foam eyepiece holder. 3.Slide cardboard spacer into foam eyepiece holder against the flat side of small lens. 4.Slide foam eyepiece holder into inner tube with cardboard spacer toward end.
Build a Refracting Telescope How does a plano-convex lens differ from a double convex lens? What knowledge or skills would be important in making telescopes? How might professional telescopes differ from these simple models?
How Light is Used as a Tool Materials –Electromagnetic spectrum poster Teacher Handout Student Handout
How Light is Used as a Tool 1.Identify a feature that is visible in several types of light. 2.Identify a feature that is visible in only one type of light.
How Light is Used as a Tool What do astronomers gain by observing the same object using different types of light? How might multi-wavelength observations affect specialization and collaboration in astronomy?
Myths vs Realities Handout Exploring with Light and Color –Full packet available –Bonnie Eisenhamer –firstname.lastname@example.org