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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

Measurement of Flatness of a Surface using Autocollimator

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1. What is the purpose of using a reflector in an autocollimator?

a: Increase the intensity of the reflected light beam Explanation

Explanation

b: Direct reflect light beam along its original path Explanation

Explanation

c: Disperse the light to spectral components Explanation

Explanation

d: To polarise the incident light beam Explanation

Explanation

2. What is the function of beam splitter in autocollimator?

a: Increase the intensity of light beam Explanation

Explanation

b: To split the return light into two separate paths Explanation

Explanation

c: Magnify the image through observed through the eyepiece Explanation

Explanation

d: Direct the light beam towards target graticule Explanation

Explanation

3. What is the function of optical micrometer in autocollimator?

a: Adjust the focal length of the collimating lens Explanation

Explanation

b: Measure the intensity of the reflected beam Explanation

Explanation

c: Measure the angular deviations of the reflected beam Explanation

Explanation

d: None of the above Explanation

Explanation

4. Why target graticule is kept perpendicular to the optical axis in autocollimator?

a: Improve the resolution of angular measurements Explanation

Explanation

b: To ensure accurate alignment of the reflected beam Explanation

Explanation

c: For enhancing the visibility of the reflected beam Explanation

Explanation

d: To minimize the errors in measurement Explanation

Explanation

5. An auto collimator is set up with a beam deviation 0.03 radians. If the focal length of the collimating lens is 60 cm. What is displacement of reflected beam on scale?

a: 20 mm Explanation

Explanation

b: 2.5 cm Explanation

Explanation

c: 3 cm Explanation

Explanation

d: 1.8 cm Explanation

Explanation

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