Question

What is the need of combination of lenses?

Answer 1

A simple lens system consists of the use of only one lens as opposed to compound lens system where multiple lenses can be used with a single common axis. ... If the lenses are separated by a distance'd', then in this case the combined focal length can be calculated using the following formula.

Answer 2

Answer:

It helps in the production of sharp and erect Images, and combining it reduces the chance of aberration.

Explanation:

Lens:- It is a transmissive optical device that is a curved piece of glass that makes thing look bigger clearer and focuses or disperses a light beam by means of refraction.

Combination of lenses is very useful in several optical instruments.

• A single lens won't be able to produce a very clear image it will always have a lot of distortion specially if we magnifying the image too much but in a combined lenses we can magnify the image without any aberration.
• We can even use it to magnify the image by keeping the focus distance same, resulting in a production of very sharp and erect image.