Chapter 33, Problem 18A

Summary Introduction

To distinguish: between rods and cones.

Introduction: Eyes help us to see things. Eyesight provides a person able to see. The outer light travels through a transparent cell called the cornea. The cornea focuses the light through an opening called the pupil. The pupil is functioned by muscles in the eyes called iris. The retina is present after the iris which projects the image onto the retina. The retina has photoreceptors called rods and cones. Rods are the reasons the eye can see dim lights whereas cones are responsible for the vision of bright light.

Explanation of Solution

Rods and cones are the photoreceptors of our eyes. They provide us vision.

Rods are responsible for the vision of dim light. It helps to see in the low-level lights. Rods are light sensitive. These are beneficial where there emerges dim or low light. Rods do not provide color vision.

Cones are responsible for bright light vision. They provide information to the brain about the colors. Cones provide color vision.

Conclusion

Thus, this is the difference between rods and cones.