A compound light microscope with an added feature of projecting the microscopic image to a wall or projecting screen is called Projection Microscope. Projection microscope is based on the radial propagation of an electron beam from a point source. Projection microscope is interfaced with computer to project the object on wide computer screen for easy analysis. This is the best option for Textile fiber analysis. Any type of measurement like length, area, count of any fine textile fiber can be done. The Projection Microscope is very useful for classroom applications as it projects the image to a wall or computer screen.
Projection microscope forms an extremely enlarged real image of some small objects on a distant screen which can be computer screen. It is different from the viewing microscope in which the viewer observes a virtual image, located in the same plane as the object at a distance of 25 cm from the eye the closest distance of distinct vision.
In both projection and viewing microscopes,
- The objective lens focuses light from the Object to create a magnified real intermediate image.
- This image, obtained from the objective lens, serves as an object, or source of light, for the second lens.
- This second lens can be eyepiece in the viewing microscope or a projecting lens in the projecting microscope.
A viewing microscope can be converted to a projecting microscope by increasing the separation of the two lenses named objective lens and eyepiece, as the first principal focus of the eyepiece lens lies to the right of image obtained from objective piece in the projector, whereas second principal focus is to the left of image obtained from objective lens in the viewing microscope.
In general in the projection microscope, the first lens of the microscope, the objective lens, creates a magnified real image of our object. This intermediate image serves as the object or basis for the second lens of the microscope, the projector lens through which the image projects on computer screen.