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Prism Theory & Dispersion-MCQ-Basic

Dear Readers,

Physics is an important subject in preparation for various Competitive exams.To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Prism Theory & Dispersion. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. If the angle of prism is 60 ° and the angle of minimum deviation is 40 ° , the angle of refraction will be

  •  30 °
  •  60 °
  •  100 °
  •  120 °

30 °

Q2. The refractive index of the material of prism is √ 2 and its refracting angle is 30 ° . One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is

  •  45 °
  •  60 °
  •  0 °
  •  30 °

45 °

Q3. The refractive index of a particular material is 1.67 for blue light, 1.65 for yellow light and 1.63 for red light. The dispersive power of the material is

  •  0.0615
  •  0.024
  •  0.031
  •  1.60

0.0615

Q4. Rainbow is formed due to

  •  Refraction
  •  Dispersion and total internal reflection
  •  Total internal reflection
  •  Scattering

Dispersion and total internal reflection

Q5. A monochromatic light is passed through a prism,.......... colour shows minimum deviation

  •  Red
  •  Violet
  •  Yellow
  •  Green

Red

Q6. The angle of a prism is 30 ° . The rays incident at 60 o at one refracting face suffer a deviation of 30 ° . The angle of emergence is

  •  0 °
  •  30 °
  •  60 °
  •  90 °

0 °

Q7. If the refractive angles of two prisms made of crown glass are 10 ° and 20 ° respectively, then the ratio of their colour deviation powers will be

  •  1 : 1
  •  2 : 1
  •  4 : 1
  •  1 : 2
1 : 2

Q8. Which one of the following alternative is FALSE for a prism placed in a position of minimum deviation

  •  i 1 = i 2
  •  r 1 = r 2
  •  i 1 = r 1
  •  All of these

i 1 = r 1

Q9. The refracting angle of a prism A is small. The correct statement for the dispersive power of a prism is that dispersive power

  •  Depends upon the material of the prism
  •  Depends upon both material and angle of prism
  •  Depends only upon refracting angle of prism
  •  Is same for all colors of white light

Depends upon the material of the prism

Q10. Dispersion of light is due to

  •  Wavelength
  •  Intensity of light
  •  Density of medium
  •  None of these

Wavelength



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