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RAY OPTICS MCQs

Total Questions : 35 | Page 2 of 4 pages
Question 11. The larger the index of refraction the
  1.    larger the critical angle
  2.    smaller the critical angle
  3.    no change to the critical angle
  4.    what?!
 Discuss Question
Answer: Option B. -> smaller the critical angle
Question 12. Light produced by an object due to being a very high temperature is called
  1.    fluorescent
  2.    electric discharge
  3.    incandescent
  4.    triboluminescence
 Discuss Question
Answer: Option C. -> incandescent
Question 13. The angle of incidence for an equilateral prism is 600
  1.    1.414
  2.    1.732
  3.    1.33
  4.    9/8
 Discuss Question
Answer: Option B. -> 1.732
Question 14. If frequency increases, wavelength ____
  1.    increases
  2.    decreases
  3.    stays the same
  4.    None of these
 Discuss Question
Answer: Option B. -> decreases
Question 15. A ray of light is incident on a glass sphere of refractive index 1
  1.    Tan-1(2/3)
  2.    sin-1(2/3)
  3.    900
  4.    cos-1(2/3)
 Discuss Question
Answer: Option C. -> 900
Question 16. If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is _______________
  1.    4 cm
  2.    (√2 +1) cm
  3.    2√2 cm
  4.    ( 2 + √2 ) cm
 Discuss Question
Answer: Option B. -> (√2 +1) cm
Question 17. A double convex thin lens made of glass (refractive index  = 1
  1.    L = 20 cm
  2.    L = 10 cm
  3.    L = 40 cm
  4.    L = 20 / 3 cm
 Discuss Question
Answer: Option A. -> L = 20 cm
Question 18. A boy uses blue colour of light to find the refractive index of glass
  1.    the same
  2.    μ decreases
  3.    μ increases
  4.    same as speed of light
 Discuss Question
Answer: Option B. -> μ decreases
Question 19. For total internal reflection to take place ray of light should go from
  1.    Rarer to denser medium
  2.    Denser to rarer medium
 Discuss Question
Answer: Option B. -> Denser to rarer medium
Question 20. Twinkling of stars is due to
  1.    Scattering of light
  2.    Reflection of light
  3.    Refraction of light
  4.    All of above
 Discuss Question
Answer: Option C. -> Refraction of light

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