Optics


   
 
Numerical - 32
32. The spectral line for a given element in the light received from a distant star is shifted towards a longer wavelength by 0.030%. Calculate the velocity of the star in the line of sight.
 
Suggested solution:
 
Since l is increasing, the star is receding from the earth. Let v be the speed of the star with respect to the earth: The apparent wavelength 'l' is
 
 
where c is the actual wave length.
 
 
 
 
or v = 9 x 104 m/s
 
  
     
   
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Optics

  		•  Reflection of Light
  		• Spherical Mirrors
  		• Sign Conventions and Rules for Drawing Ray Diagrams
  		• Relation between Focal Length and Radius of Curvature in Spherical Mirrors
  		• Mirror Formula
  		• Linear Magnification of Spherical Mirror
  		• Applications of Spherical Mirrors
  		• Refraction of Light
  		• Relation between Relative Refractive Index and Absolute Refractive Index
  		• Total Internal Reflection and its Application
  		• Spherical Refracting Surface
  		• Lenses
  		• Lens Formula
  		• Lens Maker's Formula
  		• Ray diagrams for convex lens showing the formation and nature of image for different positions of the object
  		• Thin Lenses Placed in Contact
  		• Power of a Lens
  		• Prism
  		• Dispersion of Light
  		• Applications of Prism
  		• Spectra
  		• Scattering of Light
  		• Human Eye
  		• Camera
  		• Simple Microscope or Magnifying Lens
  		• Compound Microscope
  		• Astronomical Telescope
  		• Reflecting Telescope
  		• Wave Optics - Introduction
  		• Wavefront
  		• Huygen's Wave Theory
  		• Verification of Laws of Reflection on the basis of Huygen's Wave Theory
  		• Verification of Laws of Refraction based on Huygen's Wave Theory
  		• Superposition of Interference
  		• Interference of Light
  		• Coherent Sources
  		• Young's Double Slit Experiment
  		• Diffraction
  		• Resolving Power
  		• Polarization
  		• Malu's Law
  		• Scattering Due to Polarization
  		• Applications of Polarized Light
  		• Doppler Effect in Light
  		• Summary
  		• Summary(Contd...)
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    Animations
  		• Reflection of Light
  		• Verification of Laws of Reflection
  		• Spherical Mirrors
  		• Formation of image by a Concave Mirror
  		• Formation of image by a Convex Mirror
  		• Uses of Spherical Mirrors
  		• Image due to Multiple Reflection of Light
  		• Refraction
  		• Verification of Laws of Refraction
  		• An Alternate Method
  		• Real Depth and Apparent Depth
  		• Some Effects of Refraction
  		• Total Internal Reflection
  		• Effects of Total Internal Reflection
  		• Lenses
  		• Image Formation by a Convex Lens
  		• Image Formation by a Concave Lens
  		• What is a Prism?
  		• Dispersion of White Light
  		• Angle of Deviation of a Prism
  		• Colour Phenomena in Nature
  		• External Features of the Human Eye
  		• Simple Microscope
  		• Compound Microscope
  		• Astronomical Telescope
  		• Huygen's Wave Theory
  		• Verification of Snell's Law Using Huygens Principle
  		• Interference
  		• Young's Double Slit Experiment
  		• Diffraction of Light
  		• Polarisation of Light and Polaroids