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Exam 25: Optical Instruments

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Question 41

Multiple Choice

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The eye changes its f-number by:

A) using the iris to change the size of the pupil.
B) using the ciliary muscle to change the focal length of the lens.
C) Both a & b are correct.
D) The eye does not change its f-number.

E) None of the above
F) B) and D)

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Question 42

Multiple Choice

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The Palomar reflecting telescope has a parabolic mirror with an 80 m focal length.What is the magnification achieved when an eyepiece of focal length 3.2 cm is used?

A) 625
B) 800
C) 1250
D) 2500

E) B) and C)
F) A) and B)

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Question 43

Multiple Choice

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If different filters are used with an astronomical telescope,which of the following would give the best resolution?

A magnifying lens with a focal length of 20 cm has what magnification when the viewing eye is relaxed?

A binary star system in the constellation Orion has an angular separation between the stars of 5*10^-5 radians.Assuming a wavelength of 500 nm,what is the smallest aperture (diameter) telescope that will just resolve the two stars? (1 nm = 10^-9 m)

I take two pictures of my dog Kaycee.I use the same film and level of illumination for both pictures,but I triple the f-number for the second picture.By what factor will the required time of exposure change if the film is to receive the same total light energy?

A person's prescription for bifocals is -0.12 diopter for distant vision and +3.20 diopters for near vision,the near vision being accomplished by inserts into the distant vision lens.What is the net power of the near vision correction?

A 1.6-m tall woman stands 7.0-m in front of a camera with a 6.0-cm focal length lens.What is the size of the image formed on film?

The Michelson interferometer is a device that may be used to measure:

Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil) at night is 0.70 cm and the length of the eye is 3.1 cm.Assume the wavelength of starlight in the eye is 500 nm.(1 nm = 10^-9 m)

What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.20 cm and 4.5 cm,respectively,and a separation between lenses of 40 cm?

A low f-number:

A camera lens is initially set at f/32 for a shutter speed of 1/15 s.If the amount of lighting on the subject is unchanged,and the lens is set at f/16,what is the proper shutter speed at this setting?

Even relatively small astronomical telescopes are ordinarily not used for terrestrial observation because:

If a person is farsighted the corrective lens will:

A microscope has an objective lens with an aperture diameter 0.70 cm.A monochromatic light source of wavelength 580 nm is used to illuminate the object.It is determined that the minimum angle of resolution is 1.13 x 10^-4 rad.If the present lens were replaced by one with an aperture of diameter 0.90 cm,what would the minimum angle of resolution now become? (1 nm = 10^-9 m)

Which term identifies the defect where the lens produces a line image of a point source?

Doubling the aperture diameter of a camera lens will change the light intensity admitted to the film by what factor?

A lens with a focal length of 10 cm has what power?

If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length doubled,what will happen to the overall magnification of the microscope?