PHYSICS QUIZ-03, Wave Optics

WAVE OPTICS

Objective Type Questions (One option is correct)

01. The wavefront from a point source is:
      1) Cylindrical    
      2) Spherical    
      3) Plane    
      4) Cubical

      Sol. Answer (2)

02. Young's double slit experiment establishes that
      1) Light consists of waves 
      2) Light consists of particles
      3) Light consists of neither particles nor waves 
      4) Light consists of both particles and waves
      
      Sol. Answer (1)

03. Monochromatic green light of wavelength 5×10–7 m          
      illuminates a pair of slits 1 mm apart. The separation of bright 
      lines on the interference pattern formed on a screen 2 m away 
      is:
      1) 0.25 mm      
      2) 0.1 mm      
      3) 1.0 mm      
      4) 0.01 mm
   
     Sol. Answer (3)
     Fringe width β=λD/d

04. In Young's double slit interference experiment, the slit 
      separation is made 3 folds. The fringe width becomes:
      1) 1/3               
      2) 1/9               
      3) 3                
      4) 9 
      
      Sol. Answer (1)
      Fringe width β=λD/d

05. In Young's double slit experiment, the distance between the slits
      is reduced to half and the distance between the slit and the
      screen is doubled, then fringe width:
      1) Will not change           
      2) Will become half
      3) Will be doubled          
      4) Will become four times

      Sol. Answer (4)

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