Exam 26: Relativity: Part A

The Yerkes refracting telescope has a 1-m diameter objective lens of focal length 20 m and an eyepiece of focal length 2.0 cm.What is the magnification of the planet Mars as seen through this telescope?

Increasing the focal length in a telephoto lens by a factor of nine,while keeping the aperture size constant,will change the f-number by what factor?

A given individual is unable to see objects clearly when they are beyond 75 cm.What focal length contact lens should be used to correct this problem?

A nearsighted person cannot see objects clearly beyond 50 cm (the far point).If the patient has no astigmatism and contact lenses are prescribed,what is the power of the lens required to correct the patient's vision?

A magnifying lens with a focal length of 10 cm has what maximum magnification? (Assume the near point is 25 cm).Do not use the approximation formula.

You are building a compound microscope with an objective lens of focal length 1.1 cm and an eyepiece lens of focal length 5.0 cm.You mount the lenses 18 cm apart.What is the approximate magnification of your microscope?

I take two pictures of my dog Kaycee.I use the same film and level of illumination for both pictures,but I halve 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?

Halving the focal length of a telephoto lens,while holding aperture size constant,will change the light intensity admitted to the film by what factor?

A pinhole camera is used to photograph a 23-cm tall object at a distance of 3.0 m,the image being projected on film at a distance of 46 cm from the pinhole.What are the height and orientation of the image?

A camera is used to photograph the full moon,which has an angular diameter of 0.51°.The image on the film is 2.5 mm in diameter.What is the focal length of the lens?

When using an eyepiece of focal length f,the Yerkes refracting telescope gives a magnification of 800.What focal length eyepiece would yield a magnification of 500?

A simple magnifier makes an image appear at the near point distance from the eye of the viewer (25 cm).What is the magnifying power of the magnifier if it is constructed of a lens of focal length of 6.3 cm? Do not use the approximation formula.

A telescope has an objective lens with a focal length of 90 cm and an eyepiece of focal length 3.0 cm.What is the angular magnification of the telescope?

A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 38 cm and 0.40 cm,respectively.What is the angular magnification of this instrument?

A camera has a lens of focal length 50 mm and an f-number of 4.0.What is the diameter of the lens?

Decreasing the aperture diameter of a camera lens by a factor of three will change the f-number by what factor?

A 1.5-m tall woman stands 5.0 m in front of a camera with a 8.0 cm focal length lens.What is the size of the image formed on film?

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 5.0 cm is used?

Which of the following would decrease the magnification of a compound microscope?

A lens with a focal length of 12 cm has what refractive power?