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CHAPTER-17 Light and Image Formation. Chapter Outline. 1 Reflection and Image Formation 2 Refraction of Light 3 Lenses and Image Formation 4 Focusing Light with Curved mirrors 5 Eyeglasses, Microscopes, and Telescopes Everyday Phenomenon: Rainbows and Laser Refractive Surgery.
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Chapter Outline 1 Reflection and Image Formation 2 Refraction of Light 3 Lenses and Image Formation 4 Focusing Light with Curved mirrors 5 Eyeglasses, Microscopes, and Telescopes Everyday Phenomenon: Rainbows and Laser Refractive Surgery
How Are Light Rays Related to wavefronts? Wavefronts are perpendicular to the rays.
The Law of Reflection The angle of incidence = The angle of reflection.
Definition Of The Index Of Refraction The index of refractionn of a material is the ratio of the speed c of light in a vacuum to the speed v of light in the material:
Apparent Depth of Fish Is Smaller Than Actual Depth Due to Refraction
Why a Diamond Sparkles? Why does a diamond exhibit such brilliance? And why does a diamond lose much of its brilliance when placed under water?
Optical Instruments Many optical instruments, such as binoculars, periscopes, and telescopes, use glass prisms and total internal reflection to turn a beam of light through 90° or 180°.
Primary Rainbow Water droplet disperses the light into colors.
Secondary Rainbow Colors are reversed and less intense.
Diverging or Negative lens:Focal Point (F) and Focal Length (f)
Optical Instruments • Human eye • Camera • Eyeglasses • Microscope • Telescope
Vision Defects • Nearsightedness: can see only nearby objects clearly. • Farsightedness: can see only far objects clearly.
How Does a Microscope Work? • Used to view small things nearby. • Consists of two positive lenses, objective and eyepiece. • Final image is magnified and inverted. • Ray diagram can be used to illustrate the image formation.
Microscope A laboratory microscope has 3 or 4 objective lenses.