Exam 26: Applications of Optics

An unclad optical fiber has index of refraction 1.70. What is the acceptance angle for this fiber? The acceptance angle is the greatest angle at which the light enters the end of the fiber and still causes total internal reflection.

Doubling the f-number of a camera lens will change the light intensity admitted to the film by what factor?

If a person is nearsighted the corrective lens will:

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.

Why is it easier to see fine print in brighter light than in dimmer light?

A CD player uses a laser with wavelength 900 nm. If the CD has a plastic coating with index 1.50, what is the wavelength in the plastic?

A compound microscope has an eyepiece that:

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?

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 person can see well close up, but cannot do so in the distance. To correct this, lenses that are _____ having a _____ refractive power could be used.

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?

A camera lens is initially set at f/16 for a shutter speed of 1/30 s. If the amount of lighting on the subject is unchanged, and the lens is set at f/5.6, what is the proper shutter speed at this setting?

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 magnifying lens of refractive power d (in diopters) gives what magnification when the viewing eye is relaxed assuming a near point of 25 cm?

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

While a camera has film where the image is formed, the eye forms the image on the:

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?

You are designing contact lenses for someone whose near point is 43 cm. What focal length lens should you prescribe so that an object can be clearly seen when placed at 25 cm in front of the eye?

An optical fiber with index of refraction 1.60 is clad in a material of index 1.30. What is the ratio of the maximum time to the minimum time for light signals to travel down a given length of this fiber?

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?