Looking for a Tutor Near You?

Post Learning Requirement »
x

Choose Country Code

x

Direction

x

Ask a Question

x

Hire a Tutor
Dubai

Presentation On Light

Loading...

Published in: Physics
243 Views

Physics Alevel

Areesha A / Dubai

0 year of teaching experience

Qualification: IGCSE-AS Level-A level

Teaches: Biology, Chemistry, English, Physics, Science, Phonics, Maths, English Language

Contact this Tutor
  1. Let there be .
  2. The Nature of Light What is Light? By the 17th century, light had been observed to... travel in straight lines 1. reflect 2. refract 3. transmit energy from 4. one place to another Two theories could explain these phenomena.
  3. The WAVE THEORY, advocated by Christian Huyqens and Robert Hooke, said that light was a wave. The PARTICLE (corpuscular) THEORY, advocated by Isaac Newton and later by Ejgccg&gplace, said that light was made up of a stream of tiny particles Specimen called corpuscles.
  4. The more popular theory was the , theory because of the reputation of Isaac Newton. Newton's particle theory could easily explain the straight line travel of light. reflection. and energy transmission, but had trouble explaining refraction. Newton's explanation of refraction required that light must travel faster in water than in air. Huygen's wave theory could easily explain reflection, energy transmission, and refraction, but had difficulty explaining the straight line travel of light. The wave theory's explanation of refraction required that light must travel slower in water than in air.
  5. The debate among the two sides continued through the mid 1800's. - interference of light was discovered 1801 of light (actually observed 1816 - diffraction in the 1600's but not given much significance) was explained using interference principles Neither phenomena could be explained satisfactorily by the particle theory. The final blow to the particle theory came in 1850 when Jean Foucault discovered that light traveled faster in air than in water.
  6. It was then widely accepted that light was a wave, but what kind of wave? In 1865, James Maxwell developed ideas began by Michael Faraday into a series of equations that proposed the electromagnetic wave theory. It said that light was a type of e/m wave: a periodic disturbance involving electric and ma netic forces. In 1885, Heinrich Hertz experimentally confirmed the e/m theory.
  7. Click here and here to view simulations of electromagnetic waves. THE ELECTROMAGNETIC SPECTRUM 10--7 met—s) Sit. a per Click 106 1 100 101 here to explore a tutorial production of e/m waves. on the
  8. At the end of the century, many physicists felt that all the significant laws of physics had been discovered. even stated, "The wave theory of light is, from the point of view of human beings, a certainty.' That view was soon to change. Around 1900 -b}je was observed. photoelectric effect "the emission of electrons by a substance when illuminated b e/m radiation" Careful study of the photoelectric effect was performed by many scientists.
  9. The wave theory could not totally explain the photoelectric effect, but a variation of the old particle theory could! Max Planck and Albert Einstein subsequently proposed the QUANTUM THEORY. THE QUANTUM THEORY Scan Institute of Physics The transfer of energy between light radiation and matter occurs in discrete units called quanta, the magnitude of which depends on the frequency of radiation.
  10. Although we still commonly characterize light as a wave, it is actually wave nor a particle. It seems to have characteristics of both. The modern view of the nature of light recognizes the dual character: Light is radiant energy transported in photons that are guided along their path by a wave field.
  11. This leads us to the Duality Principleu Light is a wave when it acts like a wave a particle when it acts like a particle
  12. Visible light is that portion of the electromagnetic spectrum which stimulates the retina of the Visible Light Region of the Spectrum human eye. Visible spectrum o.7gn o.Eem wavelengths range O aprn UltraVide from about 400 nm (violet) to 760 nm (red) u Light travels at about 3 x 108 m/s through empty space and slightly slower through air. Remember that for all waves, v = f X.
  13. coz Materials may be classified as: - readily transmits light; transparent can clearly see objects through them translucent - transmits, but diffuses, light; cannot see objects clearly through them - transmits no light; opaque cannot see through them
  14. WHITE light is composed of all colors. Red, orange, yeJJ0\JY, green, blue, violet is the order of wavelength Frequencies directly above this spectrum are ultraviolet. Frequencies directly below this spectrum are infrared
  15. The color of an opaque object depends on the (frequencies) of light CDJDf3 upon it and on the incident (frequencies) of light reflected The color of a transparent object depends on the (frequencies) of light upon it and on the incident CDJOf3 (frequencies) of light
  16. Complimentary colors are two colors that combine to form white light. Red and blue and and magenta green are pairs of complimentary colors. Red, blue, and green are called rimary colors or secondary pigments Cyan, yellow, and magenta are called primary pigments or secondary colors.
  17. These sites let you simulate mixing colors and pigments of light: linkl, link2, link3 Learn more about color mixing here. Color Wheel Red Red-violet Red-orange Orange Yellow- Blue-violet orange Yellow Blue Yellow-green G reen green @EnchantedLearnin .com "But I learned that the primary colors are red, blue, and yellow - not red, blue, and green." Read about it here.
  18. POLARIZATION Only transverse waves may become polarized. A is Of t.h•t asömt:irgi• a a boriumta.l PIMP. Click here, to explore A Fir 'f Polarrid filters are of all li*n. here, here, and here polarization of light. Polarization of Light Waves Polarizer 1 (Vertical Incident Beam (Unpolarized) Figure 1 Polarizer 2 (Horizontal) Vertically Polarized Light Wave

Need a Tutor or Coaching Class?

Post an enquiry and get instant responses from qualified and experienced tutors.

Post Requirement

Related PPTs

Upload PPTs

If you have your own PowerPoint Presentations which you think can benefit others, please upload on MyPrivateTutor. For each approved PPT you will get 100 Credit Points and 100 Activity Score which will increase your profile visibility.

Upload Now
Home > PowerPoint Slides > Presentation On Light