The compound microscope ; magnification and resolution

the compound microscope is

An instrument for magnification of the angle of sight of small objects invisible to the unaided eye

The mechanical system consists of

base and arm, object stage, tube, rotating turret for objective lenses, fine and coarse focus adjustment knobs

An illumination system consists of

a light source, collimator, condenser, and diaphragms for shaping the illuminating light

The image created by the objective lens is

Enlarged, inversed, real

The image created by the eyepiece is

enlarged, upright, virtual

Transverse magnification of the component of the optical system

the ratio between a transverse dimension of the image and the corresponding transverse dimension of the object

Microscope magnification is

the product of the transverse magnification of the objective lens, the transverse magnification of the eyepiece

Two images are considered separate if

the distance between their centers is not less than their radius

The resolution limit of the compound microscope is

the smallest distance between two points of the object at which they are imaged separately

The aperture angle of the objective front lens is the

The half - angle of the maximum cone of light originating from the object and entering the objective lens

The resolution limit can be reduced by using

objectives with a larger numerical aperture and light with shorter wavelength

The effective aperture angle of the immersion objective lenses becomes

larger and the resolving power increases

The image for the bright field microscopy is produced by

light transmitted or reflected by the object

The image for the dark field microscopy is produced by

light scattered by the object

Phase contrast microscopy is used for

imaging of low contrast objects

An illumination system provides the required …….. ,…….. , ……….. of the illuminating light beam

intensity, diameter, convergence

The front lens of the objective determines the …….. and the remaining lenses correct the

magnification, aberrations

The eyepiece concsists of two or more lenses . The …… lens determines the ….. of the eyepiece

upper , magnification

Objective magnification depend on the ….. and the …..

focal length of the objective lens; optical length of the tube

Eyepiece magnification depends on the ………. and the ……

focal length of the eyepiece; normal near point distance for the eye

as a result of diffraction of light , the image of a point is a ………. surrounded by …….

disk ; diffraction rings