Question

_______ of a microscope is a dimensionless number

Wavelength of incident light on lens


Optical resolution


Numerical Aperture


Focal length of lens​

Answer 1

Numerical Aperture of a microscope is a dimensionless number.

Explanation:

• In an imaging system, for the incoming light, the angular acceptance has been measured and it is known as numerical aperture. Its unit is dimensionless.
• Its definition can be applied to microscopic objectives. Based on the type of microscope, it can be designed for producing an image at a finite distance or at infinite distance.
• Its opening angle has been taken from the midpoint of the provided object plane. It is controlled by the optical aperture of the object side.  

To know more about Numerical Aperture,

1) Define the term Numerical aperture.

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2) What is numerical aperture

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Answer 2

Numerical Aperture  of a microscope is a dimensionless number

Option (C) is correct.

Explanation:

• Numerical aperture is defined as the dimensionless number that characterizes the range of the angles in the optical system.
• In an optical system, the range of angles determines whether the system can emit the light or it can accept the light coming from the particular source placed at a distance.