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