2023-05-01T05:06:40+03:00[Europe/Moscow] en true True or False: Light Waves are longitudinal waves., In unpolarized light, the electric field oscillates..., In polarized or linearly polarized light, electric field oscillates..., The most common technique to polarize light is through..., When an unpolarized beam goes through a polarizer, the transmitted beam is polarized (parallel to the transmission axis of the polarizer). If the intensity of the incident (unpolarized) light is l0, the intensity of the transmitted polarized light is , When a polarized light goes through another polarizer, the transmitted light is polarized (parallel to the transmission axis of the second polarizer). If the intensity of the incident polarized light is lo, the intensity of the transmitted light is, As θ increases, , Polarized light goes through a polarizer. If the angle between the transmission axis and the polarization of light is 30, what percentage of intensity will go through?, Unpolarized light goes through a polarizer. What percentage of the energy of the light will be transmitted through? , The transmitted light intensity is a minimum when the transmission axes are , The transmitted light has maximum intensity when the transmission axes, In this configuration if θ2=45º and θ3=90º , what percentage of the initial intensity will be transmitted through the three polarizers? Assume the incident beam is unpolarized., To find brewster's angle:, Find the Brewster's angle for light reflected by the surface of water (n=1.33) , Is the image formed on the eye real or virtual?, The far point for a normal eye is..., The near point for a normal eye is..., The power (P) of lens is, For a convex (converging lens) the power is.., For a concave (diverging lens) the power is, v How do you add the powers of two lenses?, What type of lens is used to correct nearsightedness?, What type of lens is used to correct farsightedness?, Since near point of farsighted point, Formula for farsightedness, 1.     For nearsightedness, formula, What is the refractive power of a lens that we have to use for a person with a far point of 35cm?, Two campers wish to start a fire during the day. One camper is nearsighted and one is farsighted. Whose glasses should be used to focus the Sun's rays onto some paper to start the fire? flashcards
Unit 4 - Polarization of Light Waves

Unit 4 - Polarization of Light Waves

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  • True or False: Light Waves are longitudinal waves.
    False: They are transverse waves.
  • In unpolarized light, the electric field oscillates...
    In all possible directions perpendicular to the direction of the propagation Examples include sunlight
  • In polarized or linearly polarized light, electric field oscillates...
    Only In a single direction
  • The most common technique to polarize light is through...
    Selective absorption
  • When an unpolarized beam goes through a polarizer, the transmitted beam is polarized (parallel to the transmission axis of the polarizer). If the intensity of the incident (unpolarized) light is l0, the intensity of the transmitted polarized light is 
    a.     1/2I0. (half the original intensity) b.     Memorize will not be on formula sheet
  • When a polarized light goes through another polarizer, the transmitted light is polarized (parallel to the transmission axis of the second polarizer). If the intensity of the incident polarized light is lo, the intensity of the transmitted light is
    I = I0 cos^2 θ , where θ is the angle between the transmission axes of the two polarizers.
  • As θ increases, 
    E0 decreases
  • Polarized light goes through a polarizer. If the angle between the transmission axis and the polarization of light is 30, what percentage of intensity will go through?
    75%  
    75%  
  • Unpolarized light goes through a polarizer. What percentage of the energy of the light will be transmitted through?
    This will always be 50%
  • The transmitted light intensity is a minimum when the transmission axes are 
    at right angles to each other. Since cos90=0
  • The transmitted light has maximum intensity when the transmission axes
    are aligned with each other.
  • In this configuration if θ2=45º and θ3=90º , what percentage of the initial intensity will be transmitted through the three polarizers? Assume the incident beam is unpolarized.
    12.5%
    12.5%
  • To find brewster's angle:
  • Find the Brewster's angle for light reflected by the surface of water (n=1.33)
    a.    
  • Is the image formed on the eye real or virtual?
    Formed on screen (retina) so it is real. Note that it is upside down so the brain flips it.
  • The far point for a normal eye is...
    Infinity
  • The near point for a normal eye is...
    • 25 cm
  • The power (P) of lens is
    The inverse of the focal length in meters
    The inverse of the focal length in meters
  • For a convex (converging lens) the power is..
    Positive since the focal length is positive
  • For a concave (diverging lens) the power is
    Negative is focal length is negative.
  • v How do you add the powers of two lenses?
    a.     1/f=1/f2 +1/f1
  • What type of lens is used to correct nearsightedness?
    Diverging concave lens
  • What type of lens is used to correct farsightedness?
    Converging convex lens Image will be larger
  • Since near point of farsighted point
    1/f will always be a positive quantity
  • Formula for farsightedness
    a.      
    a.      
  • 1.     For nearsightedness, formula
    a.    
    a.    
  • What is the refractive power of a lens that we have to use for a person with a far point of 35cm?
             -2.86 diopters
             -2.86 diopters
  • Two campers wish to start a fire during the day. One camper is nearsighted and one is farsighted. Whose glasses should be used to focus the Sun's rays onto some paper to start the fire?
    The farsighted campers i. Converging lens (real focal point