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WorksheetsOptical Instruments
Total questions: 10
Worksheet time: 20mins
To increase the angular magnification of a simple microscope, one should increase:
the focal length of the lens
the power of the lens
the aperture of the lens
the object size
An optical instrument used for magnification has power 25 D of objective and 20 D of eyepiece. Whether it is a microscope or a telescope?
Microscope
Telescope
The eyepiece of an astronomical telescope has a focal length of 10 cm. The telescope is focused for normal vision of distant objects when the tube length is 1 m. The focal length of the objective is:
20 cm
10 cm
90 cm
100 cm
If the focal length of the objective lens is increased then,
Magnifying power of microscope will increase but that of telescope will decrease
Magnifying power of microscope and telescope both will increase
Magnifying power of microscope and telescope both will decrease
Magnifying power of microscope will decrease but that of telescope will increase
The magnification produced by the objective lens and the eye lens of a compound microscope are 25 and 6 respectively. The magnifying power of this microscope is:
19
31
150
120
The objective of a compound microscope is essentially:
A concave lens of small focal length and small aperture
Convex lens of small focal length and large aperture
Convex lens of large focal length and large aperture
Convex lens of small focal length and small aperture
A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is:
10
20
50
25
We make the approximation that ...
Light rays from the object are parallel at the telescope
Light rays are coming from at least 1 parsec away
Light rays are not affected by Earth's atmosphere
Light rays will form a perfect image on our screen
For angular magnification we use the equation
=fofe
=fefo
=β2α
=α2β
A Cassegrain telescope uses how many mirrors and lenses
2 mirrors and 1 lens
3 mirrors and 1 lens
2 mirrors and 2 lenses
2 mirrors and no lenses
