Optical Instruments Questions

Optical instruments are the devices which process light waves to enhance an image for a more clear view. Some commonly used optical instruments are magnifying glasses, microscopes, and telescopes.

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Important Optical Instruments Questions with Answers

1. Name five optical instruments.

Five optical instruments are cameras, periscopes, magnifying glasses, telescopes, and microscopes.

2. Choose the right answer: Telescopes use ______

1. Single-lens
2. Multiple-lens

Answer: b) Multiple lens

Explanation: to create clear images, telescopes use multiple lenses.

3. Hand lens is also known as ______

1. Magnifying glass
2. Periscope
3. Camera
4. Microscope

Answer: a) Magnifying glass

Explanation: A hand lens is also known as magnifying glass since it can be easily held in hand to view the object.

4. Which device aids in measuring angular deflections?

1. Spectrometer
2. Vertometer
3. Autocollimator
4. Interferometer

Answer: c) Autocollimator

Explanation: The device which helps in measuring angular deflections is known as an autocollimator.

5. Why is a polarimeter used?

1. To measure angular deflections.
2. To measure the refractive index of materials
3. To measure the portion of the optical spectrum
4. To measure the dispersion or rotation of polarized light

Answer: d) To measure the dispersion or rotation of polarized light

Explanation: polarimeter is used to measure the dispersion or rotation of polarized light.

6. What is a spectrometer?

The spectrometer is an optical instrument that aids in calculating the properties of light over a specific portion of the electromagnetic spectrum.

7. What is a telescope?

The telescope features either lenses or curved mirrors or sometimes both to help observe faraway objects or celestial bodies.

8. Name any five types of telescopes.

Five types of telescopes are infrared telescopes, ultraviolet telescopes, X-ray telescopes, submillimeter telescopes, and radio telescopes.

9. Which is the measurement method using the phenomenon of interference of waves.

1. Polarimetry
2. Interferometry
3. Geometry
4. Spectrometry

Answer: b) Interferometry

Explanation: Interferometry uses the interference of superimposed waves to extract information.

10. Which among the following is the telescope that deals with waves having wavelengths shorter than ultraviolet light.

1. Infrared telescopes
2. Ultraviolet telescopes
3. X-ray telescopes
4. Submillimeter telescopes

Answer: c) X-ray telescopes

Explanation: X-ray telescopes deal with waves having wavelengths shorter than ultraviolet light.

Practice Questions

1. What is a periscope?
2. What is a lens?
3. What is a microscope?
4. What is a binocular?
5. What are interferometers?