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General Knowledge > General Science

RAY OPTICS MCQs

Total Questions : 35 | Page 3 of 4 pages
Question 21. A real image is formed by a a convex lens, then it is put in contact with a concave lens and again a real image is formed
  1.    shift towards the lens system
  2.    shift away from the lens system
  3.    remain in its original position
  4.    shift to infinity
 Discuss Question
Answer: Option B. -> shift away from the lens system
Question 22. An object is held 9cm from a convex mirror and produces an image 6cm tall that is 4cm away from the mirror
  1.    -13.5 cm
  2.    13 cm
  3.    2.7 cm
  4.    -2.7 cm
 Discuss Question
Answer: Option A. -> -13.5 cm
Question 23. A concave lens is in contact with a convex lens
  1.    −75,50
  2.    -10, 15
  3.    75,50
  4.    −15,10
 Discuss Question
Answer: Option D. -> −15,10
Question 24. A plano convex lens (f = 20cm) is silvered at plane surface
  1.    20 cm
  2.    40 cm
  3.    10 cm
  4.    30 cm
 Discuss Question
Answer: Option C. -> 10 cm
Question 25. The speed of light in glass is 2 × 105 km/s
  1.    3 / 2
  2.    1.5
  3.    2 / 3
  4.    Both A & B
 Discuss Question
Answer: Option D. -> Both A & B
Question 26. Name the factors that affect the lateral displacement of light as it passes through a rectangular glass slab
  1.    thickness of block
  2.    angle of incidence
  3.    refractive index of glass
  4.    All of above
 Discuss Question
Answer: Option D. -> All of above
Question 27. How is scattering of light proportional to wavelength
  1.    Directly
  2.    Inversely
  3.    Does not depend
  4.    None of these
 Discuss Question
Answer: Option B. -> Inversely
Question 28. A monochromatic beam of light of wavelength λ passes from air into a glass block
  1.    v = c / λ
  2.    v = λ / λ'
  3.    μ = c / v
  4.    λ / λ' = μ
 Discuss Question
Answer: Option D. -> λ / λ' = μ
Question 29. Magnification of lens can be represented as M =
  1.    h'/h
  2.    -v/u
  3.    h/h'
  4.    either (a) or (b)
 Discuss Question
Answer: Option D. -> either (a) or (b)
Question 30. As the ray of light passes from air to glass, state how the wavelength of light changes
  1.    wavelength increases
  2.    wavelength decreases
  3.    wavelength remains constant
  4.    wavelength decreases and then increases
 Discuss Question
Answer: Option B. -> wavelength decreases

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