BCP Ch 19 Optics

Have your book available as you look through these notes. Diagrams help

explain the notes.

19.1 Mirrors

• Reflect• Mirror Types– Flat– Concave– Convex

• Image Types

19.2 Lenses

• Refraction• Lens Types– Convex– Concave

• Image Types

19.3 Optical Instruments

• Applications of Reflection and Refraction• Telescopes• Cameras• Microscopes

19.4 The Eye and Vision• Parts of the eye– Cornea – transparent window through which light enters

the eye. Vulnerable to damage but repairs itself very quickly.

– Iris – radially arranged muscles that regulate the amount of light entering the eye has a rounded opening:

– Pupil – this is dilated in distant vision and dim light and constricted in close vision and bright light.

– Retina – contains rods and cones (receptor cells) that respond to light. In order for images to be seen, they need to form here.

– Optic Nerve – electrical signals from rods and cones are transmitted through this and you SEE!

Common vision problems

• Nearsighted people have a long eyeball and images form in front of the retina.– Corrected with a concave lens which moves the image

to the retina– http://www.uniteforsight.org/course/image/m_eye.jp

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• Farsighted people has a short eyeball and image form behind the retina.– Corrected with a convex lens which moves the image

to the retina– http://www.uniteforsight.org/course/image/h_eye.jpg