Which of the following terms is not associated with a lens?

# Which of the following terms is not associated with a lens?

1. A
Aperture
2. B
Focal length
3. C
Principal focus
4. D
Efficiency

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### Solution:

Concept: The translucent objects are called lenses. When light refracts through lenses, an image of the item is created. There are so many terminologies used in relation to lenses. such as the main axis, the centre of curvature, etc.
Lenses are simple pieces of material with one or both of their sides being rounded. It is a simple substance with two surfaces, at least one of which is curved. In order to shape a picture of the object, lenses refract light. Every surface of a lens is a circle's face. Normal lens types include convex and concave lenses.
Converging lens or focal point is another name for convex lenses, which are thick in the middle and thin from the edges and cause incident beams to coalesce at a single point.
focal point or concave lens Diverging focus points are those that are thin in the centre and thick at the edges, wandering the equal beams of the episode.
The following phrases are now associated with lenses: > Aperture: this describes the size of the light-communicating zone. In this manner, the brightness or intensity of the image framed by a lens, which depends on the amount of light passing through the lens, will fluctuate depending on the lens's aperture.
The focal point of the empty glass circle whose centre of curvature the lens is a segment is the centre of curvature. > Principal axis: The line passing through the two communities of curvature of the focal point is referred to as the principal axis. > Principal focus: The light beams travelling in the direction of the principal axis of a convex lens after refraction meet at a point on the principal axis, which is known as the principal focus of point of convergence. The distance between the optical centre and the main point of interest is known as the focal length.
Efficiency is the ability to produce something with a minimal amount of effort. A decrease in the number of labourers required to construct a vehicle is an example of efficiency.
Hence, the correct option is 4.

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