Optical Flats MCQ

Test your knowledge with important Optical Flats MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Optical Flats MCQs on Bissoy. Bissoy App

• Which of the following is of more important in case of Type-B optical flat?
  ক

  Thickness

  খ

  Diameter

  গ

  Length

  ঘ

  Area
• Which of the following is the use of Type-A optical flats?
  ক

  Testing parallelism of measuring devices

  খ

  Testing parallelism of measuring anvils

  গ

  Testing micrometer measuring surfaces

  ঘ

  Testing the flatness of measuring table
• Which of the following is the dimension for Type-B optical flats?
  ক

  25.0 x 12.000 mm

  খ

  25.0 x 23.000 mm

  গ

  26.0 x 24.000 mm

  ঘ

  26.0 x 24.250 mm
• Type-B optical flat is tested for parallelism. What is the formula for the difference of the thickness of the flat at 2 points on the adjacent fringe? (µ is the refractive index)
  ক

  λ/2*(1/µ) microns

  খ

  λ/4*(µ) microns

  গ

  λ*µ microns

  ঘ

  λ*(µ/2) microns
• Which of the following is the method to test parallelism in Type-B optical flats?
  ক

  Hawking interferometer

  খ

  Enrico interferometer

  গ

  Fizeau interferometer

  ঘ

  Stephan interferometer
• Which of the following statement is true for optical flats? Statement 1: Type-A optical flats are tested for parallelism of working surfaces. Statement 2: Flatness of working surface is tested by comparing with a master flat.
  ক

  T, F

  খ

  F, F

  গ

  T, T

  ঘ

  F, T
• What is the tolerance on thickness for Type-B (Grade I) opticals flats?
  ক

  0.05 µm

  খ

  0.15 µm

  গ

  0.20 µm

  ঘ

  0.30 µm
• Which of the following is not the dimension of optical flat Type A as per IS : 5440—1969 in mm ?
  ক

  25 x 10

  খ

  50 x 30

  গ

  30 x 10

  ঘ

  125 x 30
• What is the tolerance on flatness for Type-A optical flats of sizes up to 100 mm?
  ক

  0.05 cm

  খ

  0.05 µm

  গ

  0.05 mm

  ঘ

  0.05 m
• Working surfaces of Type-B optical flats are inclined to each other at which angle?
  ক

  5 minute

  খ

  10 minute

  গ

  15 minute

  ঘ

  20 minute
• To what degree the edges of optical flats are bevelled?
  ক

  30o

  খ

  45o

  গ

  60o

  ঘ

  90o
• What is the coefficient of linear expansion of fused quartz used to make optical flats?
  ক

  0.6 x 10-6/ degree

  খ

  0.6 x 10-5/ degree

  গ

  0.6 x 10-4/ degree

  ঘ

  0.6 x 10-3 / degree
• Which of the following is used to make optical flats?
  ক

  Toughened glass

  খ

  Glass wool

  গ

  Fused quartz

  ঘ

  Porous glass
• How many types of optical flats are present?
  ক

  2

  খ

  1

  গ

  4

  ঘ

  3