Question
Identify the instrument shown in the picture below ?
A. Otoscope.
B. Ophthalmoscope.
C. Refractometer.
D. None of the above.
Show Answer
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Correct Answer » C
Explanation
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Ans:C. Refractometer.
The image shown is of a Hand held Refractometer
Refractometer
- It is a laboratory or field device for the measurement of an index of refraction (refractometry). .
- A traditional hand held refractometer is an analog instrument for measuring a liquid’s refractive index.
It works on the critical angle principle by which lenses and prisms project a shadow line onto a small glass reticle inside the instrument, which is then viewed by the user through a magnifying eyepiece.
There are many types of refractometers and the most common types are Abbe’s refractometer, Pulfrich refractometer, Immersion refractometer.
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