WorksheetsBOT 205_objective lenses and optical aberration
Total questions: 20
Worksheet time: 10mins
The coloured bands on the objective lenses indicate
The numerical aperture of the lenses
The working distance of the lenses
The magnification of the lenses
All of the above
Working distance of the objective lenses refers to
The distance between the objective lens and the top of the cover glass when specimen in focus
The distance between the objective front lens and the top of the cover glass when specimen in focus
The distance between the nose piece and the top of the cover glass when specimen in focus
The distance between the ocular and the top of the cover glass when specimen in focus
Numerical aperture
Determines the magnification power of the lens
Determines the light gathering power of the lens
Determines the resolving power of the lens
Determines the light gathering and resolving power of the lens
The relationship between Numerical Aperture and the Working Distance is
Directly proportional
Inversely proportional
Non proportional
None of the above
What does Apo on the label refers to?
The flat field correction
The manufacturer
The specialized optical properties
The aberration correction
Typical objective lenses come in magnifications of ___
6x, 15x, 60x
60x, 150x, 600x
4x, 10x, 40x
40x, 100x, 400x
The maximum power of a light microscope is:
1450X
2000X
400X
1000X
This figure shows the ______________ of the lens
Diverging property
Chromatic aberration
Magnification property
Converging property
The figure shows the ____________ of the lens
Spherical aberration
Diverging property
Chromatic aberration
Converging property
The image is an example of
Spherical aberration
Diverging property
Chromatic aberration
Converging property
The image is an example of
Spherical aberration
Converging property
Chromatic aberration
Convex lens
Name the figure;
Spherical aberration
Diverging property
Concave lens
Convex lens
Name the figure.
Spherical aberration
Diverging property
Concave lens
Chromatic aberration
Optical defect which resulted in an optical instrument producing a non ideal image is known as
Lens property
Aberration
Diffraction
Field correction
A lens with very low dispersion properties, exhibit less chromatic aberration than ordinary glass lens and corrected chromatically for 2-4 colours is known as
Achromat lens
Apochromat lens
Fluorite lens
None of the above
The most common objectives, corrected for chromatic aberration in two wavelengths
Achromat lens
Apochromat lens
Fluorite lens
None of the above
A lens that offers the the highest level of correction, has special dispersive properties to achieve three color crossings
Achromat lens
Apochromat lens
Fluorite lens
None of the above
When light refracts through a lens with a spherical surface, the rays that pass through the outer diameters of the lens will focus at a different point from rays that pass through the center. This causes the resulting image to be blurred because of
Chromatic aberration
Spherical aberration
Reflection
Refraction
A phenomenon when colors are incorrectly refracted by the lens, resulting in a mismatch at the focal point where the colors do not combine as they should
Chromatic aberration
Spherical aberration
Reflection
Refraction
