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Chapter 26: Q13CQ (page 955)

Propose a way to study the function of the rods alone, given they can sense light about 1000 times dimmer than the cones.

Short Answer

Expert verified

When we reduce light, the effect of the rod cells will increase in our vision.

Step by step solution

01

Rod cells and cone cells.

The main difference between rod cells and cone cells is that the rod cells are responsible for the vision under low light whereas the cone cells are responsible for the vision under higher light levels.

02

Sensitivity of rod cells and cone cells.

Since rod cells sense light 1000 times dimmer than cone cells, we can study a person’s vision in very dim light.

As we reduce the light, the effect of the rod cells will increase in our vision. So in this condition, we can do a different experiment to see how rod cells affect our vision.

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Most popular questions from this chapter

It has become common to replace the cataract-clouded lens of the eye with an internal lens. This intraocular lens can be chosen so that the person has perfect distant vision. Will the person be able to read without glasses? If the person was near-sighted, is the power of the intraocular lens greater or less than the removed lens?

A myopic person sees that her contact lens prescription is –4.00 D. What is her far point?

A cataract is a cloudiness in the lens of the eye. Is light dispersed or diffused by it?

Consider a telescope of the type used by Galileo, having a convex objective and a concave eyepiece as illustrated in Figure 26.23(a). Construct a problem in which you calculate the location and size of the image produced. Among the things to be considered are the focal lengths of the lenses and their relative placements as well as the size and location of the object. Verify that the angular magnification is greater than one. That is, the angle subtended at the eye by the image is greater than the angle subtended by the object.

There are different types of color blindness related to the malfunction of different types of cones. Why would it be particularly useful to study those rare individuals who are color blind only in one eye or who have a different type of color blindness in each eye?
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