Overall magnification of optical comparators - Metrology & Quality Control

Q.  Overall magnification of optical comparators is given as
- Published on 07 Aug 15

a. (4 d / f) x ( magnification of eye piece)
b. (2 f / d) x ( magnification of eye piece)
c. (4 f / d) x ( magnification of eye piece)
d. (2 d / f) x ( magnification of eye piece)

ANSWER: (2 f / d) x ( magnification of eye piece)

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    Discussion

  • Sravanthi   -Posted on 23 Oct 15
    - Overall magnification of optical comparators is given as (2f / d) x magnification of eye piece.
    here,

    f = focal length of lens
    d = distance between pivot and plunger

    - Optical comparators depend upon optical system and magnified image of work piece. This helps in obtaining high degree of accuracy.

    - The accuracy of these comparators is limited to 0.001 mm. They have no parallax error and have high magnification.

    - Readings can be easily obtained in a dark room when scale is projected on a screen. They are not very convenient to use due to eye piece. Due to high magnification they have achieve high precision.

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