Question

In light microscope which lens does not take part in image formation?

• A. Objective$\left(5X\right)$
• B. Objective$\left(45X\right)$
• C. Condenser(D)
• D. Ocular

Answer 1

The correct option is C Condenser(D)

An objective lens is the most important optical unit that determines the basic performance/function of an optical microscope To provide an optical performance/function optimal for various needs and applications (i.e. the most important performance/function for an optical microscope), a wide variety of objective lenses. The objective lens gathers light from the specimen, magnifies the image of the specimen, and projects the magnified image into the body tube.
The purpose of the condenser lens is to focus the light onto the specimen. Condenser lenses are most useful at the highest powers (400x and above). Microscopes with a stage condenser lens render a sharper image than those with no lens (at 400x). The Abbe condenser lens can be moved up and down.

The ocular lens, or eyepiece, magnifies the image. It contains a measuring scale called and ocular micrometer. The ocular micrometer has no units. Revolving Nose Piece - Several objective lenses of varying magnification and numerical aperture are mounted on the revolving nosepiece.
So, the correct option is C.