Oculars – Huygens Compensating, Flat-field, Condenser Objective Question

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1. Which of the following is not the function of ocular?

  • a) It magnifies the real image of the object formed by the objective
  • b) It corrects some of the defects of the objective
  • c) It images cross hairs, scales or other objects located in the eyepiece
  • d) It condenses light rays coming from the light source

2. What is the most common type of eyepiece?

  • a) Huygenian
  • b) Hyperplane
  • c) Compensating
  • d) All of the above

3. What is true about convex surfaces of lenses of huygenian ocular?

  • a) Convex surfaces of both lenses face downward
  • b) Convex surfaces of both lenses face upward
  • c) Convex surface of upper lens faces upward, and lower lens faces downward
  • d) Convex surface of upper lens faces downward, and lower lens faces upward

4. How many plano-convex lenses are present in huygenian eyepiece?

  • a) 4
  • b) 2
  • c) 3
  • d) 1

5. Which of the following ocular is also known as eyepiece?

  • a) Compensating
  • b) Huygenian
  • c) Hyperplane
  • d) All of the above

6. What is an eye lens?

  • a) Objective lens
  • b) Huygenian eyepiece
  • c) Topmost lens of the eye-piece
  • d) Condenser lens

7. The rays emerging through eye-lens, pass through a small circular area called:

  • a) Ramsden disk
  • b) Eye point
  • c) Both of the above
  • d) Huygenian point

8. In eye-piece real image of the object is formed:

  • a) On the eye-piece lens nearer to the objective
  • b) On the eye-piece lens nearer to the eye
  • c) Between the two eye-piece lenses
  • d) All of the above

9. In huygenian eye-piece distance separating the two lenses is always:

  • a) A little greater than the focal length of the eye lens
  • b) A little smaller than the focal length of the eye lens
  • c) Equal to the focal length of the objective lens
  • d) A little greater than the focal length of the lower objective lens

10. An image should be viewed with the eye placed at the Ramsden disk in order to obtain:

  • a) The largest field of view
  • b) The maximum brightness over the field
  • c) Both a) and b)
  • d) The minimum brightness over the field

11. Which of the following ocular has highest quality?

  • a) Hyperplane
  • b) Huygenian
  • c) Compensating
  • d) All of the above

12. ____, _ and _ oculars should be used to cover higher power (oil immersion objective, intermediate power (high power objective) and low power respectively.

  • a) Huygenian, hyperplane, compensating
  • b) Compensating, huygenian, hyperplane
  • c) Compensating, hyperplane, huygenian
  • d) Huygenian, compensating, hyperplane

13. Why huygenian oculars are not desirable to use with higher power objectives?

  • a) Because it gives uncorrected astigmatism
  • b) Because it gives uncorrected lateral color
  • c) Because it gives uncorrected curvature of the field
  • d) Both b) and c)

14. What is the other name of hyperplane ocular?

  • a) Planoscopic
  • b) Periplane
  • c) Both of the above
  • d) Compensating

15. Hyperplane oculars are employed with _ objective:

  • a) Achromatic
  • b) Apochromatic
  • c) Fluorite
  • d) All of the above

16. Which of the following ocular gives midway color compensation?

  • a) Hyperplane
  • b) huygenian
  • c) compensating
  • d) All of the above

17. What is true for lens system present in compensating eyepiece?

  • a) Apochromatic triplet lenses
  • b) Achromatic triplet lenses
  • c) Apochromatic double lenses
  • d) Achromatic double lenses

18. Compensating eyepieces are used with _ objective:

  • a) Apochromatic
  • b) Higher power achromatic
  • c) Fluorite
  • d) All of the above

19. What is the function of a condenser?

  • a) To gather the light rays for illumination of object
  • b) To produce and gather light rays
  • c) Both of the above
  • d) To view the object

20. Where the condenser is located?

  • a) Over the stage of the microscope between the mirror and the object
  • b) Under the stage of the microscope between the mirror and the object
  • c) Under the stage of the microscope between the mirror and the objective
  • d) Over the stage of the microscope between the ocular and the object

21. What is the most popular sub-stage optical system?

  • a) Variable focus condenser
  • b) Abbe condenser
  • c) Achromatic condenser
  • d) All of the above

22. ____ is the NA of most commonly employed Abbe condenser.

  • a) 1.25
  • b) 1.00
  • c) 1.40
  • d) 0.65

23. A condenser is must for the examination of the object with ____ objective:

  • a) Oil immersion
  • b) Low power
  • c) High power
  • d) All of the above

24. If the NA of condenser is less than NA of objective lens, then:

  • a) The back lens of the objective receives too less light resulting in decrease in contrast
  • b) The back lens of the objective receives too less light resulting in increase in contrast
  • c) The back lens of the objective receives too much light resulting in increase in contrast
  • d) The back lens of the objective receives too much light resulting in decrease in contrast

25. Which condenser contains NA more than 1.25?

  • a) Apochromatic
  • b) Achromatic
  • c) Variable focus
  • d) Abbe

26. The the condenser aperture, the the depth of focus and the ___ the contrast of components of the image:

  • a) Smaller, greater, greater
  • b) Greater, smaller, greater
  • c) Smaller, greater, smaller
  • d) Greater, greater, greater

27. What is incorrect for Abbe’s condenser?

  • a) Its NA is 1.25
  • b) Utilizes only 2 lenses
  • c) Corrected for spherical and chromatic aberrations
  • d) Extensively used in general microscopy

28. __ condenser is a two-lens system:

  • a) Abbe
  • b) Variable focus
  • c) Achromatic
  • d) Both a) and b)

29. How does variable focus condenser differ from Abbe condenser?

  • a) Its NA is greater than 1.25
  • b) It contains more than two lenses
  • c) Lower lens is focusable while upper lens is fixed
  • d) All of the above

30. Variable focus condenser is same as that of Abbe condenser, when:

  • a) Both lenses are situated at a same position
  • b) Lower lens is raised to its top position
  • c) Upper lens is lowered to below position
  • d) All of the above

31. When focusable lens of variable focus condition is lowered, the light focus emerges as a:

  • a) Point of light
  • b) Large diameter parallel bundle of light
  • c) Exactly same as that of the diameter of objective lens
  • d) None of the above

32. What is true for achromatic condenser?

  • a) Its NA is 1.40
  • b) It is corrected for both chromatic and spherical aberrations
  • c) Especially recommended for research microscopy and for color photomicrography
  • d) All of the above

33. Identify the correct match between color and wavelength:

Column A: ColorColumn B: Wavelength
1. Blue-violeti)          5000 to 6000 Å
2. Green ii)         6000 to 7000 Å
3. Red iii)        4000 to 5000 Å
  • a) 1. and ii), 2. and iii), 3. and i)
  • b) 1. and iii), 2. and i), 3. and ii)
  • c) 1. and i), 2. and iii), 3. and ii)
  • d) 1. and ii), 2. and i), 3. and iii)

34 . Identify the correct match:

Column A: mediumColumn B: Refractive index
1. airi)          1.51
2. water ii)         1.00
3. Cedarwool oil iii)        1.33
  • a) 1. and ii), 2. and iii), 3. and i)
  • b) 1. and iii), 2. and i), 3. and ii)
  • c) 1. and i), 2. and iii), 3. And ii)
  • d) 1. and ii), 2. and i), 3. and ii)

35. Identify the correct match:

Column A: Type of abberationColumn B: View in microscope
1. Chromatic abberationi) Square image observed with curved sides
2. Spherical abberation ii) Colored zones or halos
3. Distortion iii) Curved image of flat object
4. Curvature of fieldiv) Greater power in outer portion of spherical surface
  • a) 1. and ii), 2. and iii), 3. And i), 4. and iv)
  • b) 1. and iii), 2. and ii), 3. And i), 4. and iv)
  • c) 1. and ii), 2. and iv), 3. And i), 4. and iii)
  • d) 1. and i), 2. and iii), 3. And ii), 4. and iv)

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