chapters-16&17 light, color, and image formation
DESCRIPTION
CHAPTERS-16&17 Light, Color, and Image Formation. Electromagnetic wave Light and Color Reflection and Image Formation R efraction of Light and Rainbow L enses and Image Formation E yeglasses , Microscopes, and Telescopes L aser Refractive Surgery. Light is an Electromagnetic wave. - PowerPoint PPT PresentationTRANSCRIPT
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CHAPTERS-16&17 Light, Color, and Image
Formation
1 Electromagnetic wave
2 Light and Color
3 Reflection and Image Formation
4 Refraction of Light and Rainbow
5 Lenses and Image Formation
6 Eyeglasses, Microscopes, and Telescopes
7 Laser Refractive Surgery
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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 108 m/s.
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Light and Color
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Blue Skies and Red Sunsets
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How Are Light Rays Related to wavefronts?
Wavefronts are perpendicular to the rays.
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How Does an Image Formed in a Plane Mirror?
Reflection
The Law of Reflection:
The angle of incidence = The angle of reflection.
ri
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How Are Images Formed by a Plane Mirror?
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Q7
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Refraction of Light
Apparent Depth of Fish Is Smaller Than Actual Depth Due to Refraction
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Rainbow
Primary Rainbow
Colors are reversed and less intense.
Water droplet disperses the light into colors.
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Focal Point (F) and Focal Length (f) of lenses
Diverging or Negative lensConverging or Positive lens
Power of a lens =1/f
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Ray Diagram
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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.
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Optical InstrumentsHuman eyeCameraEyeglassesMicroscopeTelescope
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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, Myopia Farsighted Eye,Hyperobia
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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.
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Astronomical Telescope
Used to view things far away.Consists of two positive lenses, objective and eyepiece.Final image is magnified and inverted.
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LASIK: Reading assignment