Exam 25: Vision and Optical Instruments

Rays that pass through a lens very close to the lens axis are more sharply focused than those that are very far from the axis. The inability of a lens to sharply focus off-axis rays is called spherical aberration. This effect helps us to understand why

For relaxed viewing (microscope or telescope) the eyepiece is adjusted to place the image at

Pat is viewing the moon with her new telescope. She is using a 10. mm eyepiece. Which of the following eyepieces will double the magnification?

If you wear green sunglasses and look at equations written in white chalk on a chalkboard, you would see the chalk as

Farsightedness can usually be corrected with

Which cones on the eye are most sensitive to light?

Using the Rayleigh Criterion for 400. nm light, what sized space telescope could have 1.0 km resolution of objects on Mars when viewed from above the Earth? (assume an Earth-Mars close distance of 80. million km)

What power lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?

Angular magnification of a magnifying glass is largest when the image is at

Both the microscope and the telescope make the object appear much larger. Why are these two instruments designed differently (e.g., why are the equations for magnification quite different)?

A hyperopic eye can focus on objects which are 75. cm and farther. What POWER and what FOCAL LENGTH spectacles should be prescribed so it can see objects 25. cm and farther from the eye? (Assume negligible distance between spectacles and eye.)

How is it possible for the angular magnification to be large and, at the same time, for the lateral magnification to be small? Give an example.

Choose from the following: -Match rods and cones to the best description below.

If a person's eyeball is too short from front to back, the person is likely to suffer from

Mary builds a simple magnifying telescope using two lenses of focal length 80. cm and 5.0 cm. The respective diameters are 60. mm and 10. mm. How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the "naked eye"?

Nearsightedness can usually be corrected with

A nearsighted man wears -3.00 D lenses. With these lenses, his corrected near point is 25.0 cm. What is his uncorrected near point?

Many Earth-based telescopes are larger than the Hubble Space Telescope, so what justifies the great expense of a "space-based" instrument?

Choose from the following: -Match pupil to the best description below.

Choose from the following: -Match lens to the best description below.