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Exam 24: Optical Instruments

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Question 31

Multiple Choice

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You use a camera with a lens of focal length 50.0 mm to take a picture of a 2.50 m tall statue located 7.20 m away. If the image height on the film is 18.2 mm, what is the distance from the lens to the film?

A) 5.04 cm
B) need more information
C) 6.32 mm
D) 5.24 cm

E) All of the above
F) A) and B)

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Question 32

Multiple Choice

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How is chromatic aberration corrected in large astronomical reflecting telescopes?

A) a combination of lenses designed to cancel the aberrations
B) use a parabolic mirror instead of a spherical mirror
C) a reflecting telescope has no chromatic aberration
D) change the resolution of the telescope

E) A) and D)
F) B) and D)

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Question 33

Multiple Choice

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An astronomical telescope has a magnifying power of 100 when using a 2.00 cm focal length eyepiece. How long is the barrel of the telescope?

Which of the following is not necessarily true about the image produced by a pinhole camera?

The refractive power of a lens of focal length 40 cm is

A telescope is set up in an introductory physics lab using lenses of focal lengths 10 cm and 50 cm. Since both lenses are the same diameter, it is not immediately clear which one to use as the eyepiece and which to use as the objective. If one uses the lens with a 50 cm focal length as the eyepiece, what power results?

A 5.0 cm focal length lens is used as a magnifier. Assuming a near point of 25 cm, about what magnification is attained?

What kind of lenses are used in a compound microscope?

A small object has an angular diameter of 0.50°. When viewed through a magnifier, it has an angular diameter of 8.0°. What is the angular magnification in this case?

A pinhole camera is used to produce an image of a bird that is 3.8 m away. If the size of the bird's image on the screen is 3.0% of the size of the bird, what is the distance from pinhole to screen?

Two lenses, the first with focal length 10.0 cm and the second with focal length −12.5 cm, are separated by 20.0 cm. An object of height 2.40 cm is placed 15.0 cm in front of the first lens. Which of the following characteristics does the final image have?

A 50.0 mm lens is used to take a picture of an object 1.30 m tall located 4.00 m away. What is the height of the image on the film?

An astronomical telescope is made with lenses of focal lengths 80.0 and 2.00 cm. What is the barrel length of this telescope?

For maximum angular magnification in a compound microscope, the objective focal length (f_o) and the eyepiece focal length (f_e) should be chosen so that

Two lenses with refractive powers of 10 D and 15 D are placed in contact. What is the refractive power of the combination?

The lens of a slide projector has a focal length of 10.0 cm. It is used to project the image of a 35 mm slide (24 mm × 36 mm) onto a square screen located 6.0 m away. Of the following screen widths, which is the smallest that would allow the entire image to fit?

A farsighted person cannot see clearly closer than 2.0 m. What power contact lenses would correct this near point to 25 cm?

The corrective lenses of a person suffering from which of the following vision ailments could be used to start a fire by focusing sunlight?

An astronomical telescope is made with lenses of focal lengths 80.0 cm and 2.00 cm. Two stars in the sky are separated by 0.080°. What angle of separation do they have when viewed in the telescope?

An astronomical telescope is made with lenses of focal lengths 80.0 and 1.25 cm. What magnifying power does this telescope provide?