CHAPTERS-16&17 Light, Color, and Image Formation 1Electromagnetic wave 2Light and Color 3Reflection and Image Formation 4Refraction of Light and Rainbow.

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Presentation transcript:

CHAPTERS-16&17 Light, Color, and Image Formation 1Electromagnetic wave 2Light and Color 3Reflection and Image Formation 4Refraction of Light and Rainbow 5Lenses and Image Formation 6Eyeglasses, Microscopes, and Telescopes 7Laser Refractive Surgery

Light is an Electromagnetic wave The changing magnetic field (B) creates an electric field (E) that fluctuates in time. It propagates at the speed, c = 3 x 10 8 m/s.

Light and Color

Blue Skies and Red Sunsets

How Are Light Rays Related to wavefronts? Wavefronts are perpendicular to the rays.

How Does an Image Formed in a Plane Mirror? Reflection The Law of Reflection: The angle of incidence = The angle of reflection.

How Are Images Formed by a Plane Mirror?

Q7

Refraction of Light Apparent Depth of Fish Is Smaller Than Actual Depth Due to Refraction

Rainbow Primary Rainbow Colors are reversed and less intense. Water droplet disperses the light into colors.

Focal Point (F) and Focal Length (f) of lenses Diverging or Negative lens Converging or Positive lens Power of a lens =1/f

Ray Diagram

Lens Equation and Magnification, m E6: A positive lens has a focal length of 12 cm. An object is located at a distance of 3 cm from the lens. a.How far from the lens is the image? b.State three properties of the image? (real/virtual, erect/inverted, magnified/reduced) c.Draw a ray diagram and show the image formation.

Optical Instruments Human eye Camera Eyeglasses Microscope Telescope

Human Eye: Vision Defects Nearsightedness: can see only nearby objects clearly. Correction is made with a Diverging lens or negative lens. Farsightedness: can see only far objects clearly. Correction is made with a converging lens or positive lens. Nearsighted Eye, MyopiaFarsighted Eye,Hyperobia

Microscope Used to view small things nearby. Consists of two positive lenses, objective and eyepiece. Final image is magnified and inverted. A laboratory microscope has 3 or 4 objective lenses.

Astronomical Telescope Used to view things far away. Consists of two positive lenses, objective and eyepiece. Final image is magnified and inverted.

LASIK: Reading assignment