Concept explainers
All humans have what is known as a blind spot, where the optic nerve exits the eye and no light-sensitive cells exist. To locate your blind spot, look at the figure of the cross. Close your left eye and place your index finger on the cross. Slowly move your finger to the left while following it with your right eye. At a certain point the cross will disappear. Is your right eye's blind spot on the right or left side of your retina? Explain.
Want to see the full answer?
Check out a sample textbook solutionChapter 19 Solutions
College Physics: A Strategic Approach (3rd Edition)
Additional Science Textbook Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Essential University Physics (3rd Edition)
Lecture- Tutorials for Introductory Astronomy
The Cosmic Perspective Fundamentals (2nd Edition)
University Physics (14th Edition)
University Physics with Modern Physics (14th Edition)
- Presbyopia is the tendency to gradually become far-sighted (hyperopic) as you age. If you have normal vision when you are young, you have a near point of 25 cm.A. If the distance between your eye's lens and retina is 1.67 cm, what is the focal length of your eye's lens when you look at an object at your near point?f = _______ cmB. As you get older, suppose that the near point of your eye increases to 48 cm. What is the focal length of your eye's lens when you look at an object at your near point now?f = ________ cmC. With your near point at 48 cm, what is the focal length of the corrective lens (placed directly in front of your eye's lens) which you would need to look at an object that is 25 cm in front of your eye?f = ________ cmD. As you continue to age, the corrective lenses will no longer be sufficient to allow you to see an object that is 25 cm in front of your eye. When you are wearing your corrective lenses, suppose that you can now see objects only if they are no closer than 42…arrow_forwardYou have a thin, diverging lens. If the value of q (the distance from the image to the mirror along the principal axis of the mirror) is -4.47cm and the distance of p (the distance from the object to the mirror along the principal axis of the mirror) is 24.97cm, what is the focal length of the diverging lens? Object Ray 1 Principal focal point Virtual image |f| Diverging lens Ray 1 Ray 3 Ray 2 ·\ƒ\· Secondary focal pointarrow_forwardSome lenses are shaped with one flat side and one spherically-shaped side. This shape is designed to focus parallel light rays onto a single point. In a few sentences, explain how the spherical shape of the lens' surfaces causes parallel light rays to focus on a single point. (Assume the light is travelling through air into a lens with an index of refraction greater than that of air.) Focal length Focal pointarrow_forward
- Most animals—humans included—have eyes that use lenses to form images. The eyes of scallops are different. A typical scallop eye forms images largely by reflection from a mirror- like surface at the back of the eye. as shown the important features of a typical scallop eye. The lens causes very little redirection of incoming light rays; it is the spherical surface in the back of the eye that brings rays of light to a focus on the cells of the retina. (For simplicity, we’ve shown no refraction by the lens, although the lens does cause some refraction that seems to help to make the image sharper by correcting for the spherical aberration introduced by the mirror.) The reflection is due to thin-film interference from the front and back faces of 80-nm-thick transparent crystals of guanine, index n = 1.83, that are embedded in cytoplasm with index n = 1.34. The individualeyes are quite small. A typical scallop has 40 to 60 eyes, each with a 450-mm–diameter pupil and a reflecting surface at…arrow_forwarda. At what angle below the horizontal should you insert your straw in order to hit the tapioca ball?arrow_forwardAn archaeologist is examining artifacts with a diverging lens. The lens has a focal length of magnitude 23.8 cm. The lens is always held between the archaeologist's eye and the object under study. However, the distance between the lens and the object is different for each object that the archaeologist observes. Determine the image location and magnification for each of the following three objects. In addition, determine whether the image is real or virtual, whether it is upright or inverted, and whether it makes the object appear larger or smaller than actual size. (a) The object lies 47.6 cm behind the lens. Determine the image location. (Enter the magnitude in cm.) |q| = cm Determine the magnification. M = Select all of the following that apply to the image formed in part (a). realvirtualuprightinvertedenlargedshrunken (b) The object lies 23.8 cm behind the lens. Determine the image location. (Enter the magnitude in cm.) |q| = cm Determine the magnification. M =…arrow_forward
- An archaeologist is examining artifacts with a diverging lens. The lens has a focal length of magnitude 23.8 cm. The lens is always held between the archaeologist's eye and the object under study. However, the distance between the lens and the object is different for each object that the archaeologist observes. Determine the image location and magnification for each of the following three objects. In addition, determine whether the image is real or virtual, whether it is upright or inverted, and whether it makes the object appear larger or smaller than actual size. (a) The object lies 47.6 cm behind the lens. Determine the image location. (Enter the magnitude in cm.) |q| = cm Determine the magnification. M = Select all of the following that apply to the image formed in part (a). realvirtualuprightinvertedenlargedshrunken (b) The object lies 23.8 cm behind the lens. Determine the image location. (Enter the magnitude in cm.) |q| = cm Determine the magnification. M =…arrow_forwardMost animals—humans included—have eyes that use lenses to form images. The eyes of scallops are different. A typical scallop eye forms images largely by reflection from a mirror- like surface at the back of the eye. as shown the important features of a typical scallop eye. The lens causes very little redirection of incoming light rays; it is the spherical surface in the back of the eye that brings rays of light to a focus on the cells of the retina. (For simplicity, we’ve shown no refraction by the lens, although the lens does cause some refraction that seems to help to make the image sharper by correcting for the spherical aberration introduced by the mirror.) The reflection is due to thin-film interference from the front and back faces of 80-nm-thick transparent crystals of guanine, index n = 1.83, that are embedded in cytoplasm with index n = 1.34. The individualeyes are quite small. A typical scallop has 40 to 60 eyes, each with a 450-mm–diameter pupil and a reflecting surface at…arrow_forwardMost animals—humans included—have eyes that use lenses to form images. The eyes of scallops are different. A typical scallop eye forms images largely by reflection from a mirror- like surface at the back of the eye. as shown the important features of a typical scallop eye. The lens causes very little redirection of incoming light rays; it is the spherical surface in the back of the eye that brings rays of light to a focus on the cells of the retina. (For simplicity, we’ve shown no refraction by the lens, although the lens does cause some refraction that seems to help to make the image sharper by correcting for the spherical aberration introduced by the mirror.) The reflection is due to thin-film interference from the front and back faces of 80-nm-thick transparent crystals of guanine, index n = 1.83, that are embedded in cytoplasm with index n = 1.34. The individualeyes are quite small. A typical scallop has 40 to 60 eyes, each with a 450-mm–diameter pupil and a reflecting surface at…arrow_forward
- Rank the following situations (A-D) by the focal length of the thin lens in the situation, from highest (most positive) to lowest (most negative). A: a medium of glass houses a plano-convex thin lens made of air with a radius of curvature of 10 cm B: a bi-convex thin lens made of glass sits in air and has a radius of curvature of 10 cm C: a glass, plano-concave, thin lens in air has a radius of curvature of 10 cm D: a glass, plano-convex, thin lens in water has a radius of curvature of 10 cmarrow_forwardPhysics v Q17 Choose the correct statement with respect to the combination of lenses. The combination of a convex lens and a concave lens is a concave lens if the focal 0 length of the convex lens is less than that of the concave lens. The power of combining a concave lens 0 and convex lens is more than the power of individual lenses. The combination of a convex lens and 0 concave lens of equal focal length behave as a glass slab. All the abovearrow_forwardThe smallest object we can resolve with our eye is limited by the size of the light receptor cells in the retina. In order for us to distinguish any detail in an object, its image cannot be any smaller than a single retinal cell. Although the size depends on the type of cell (rod or cone), a diameter of a few microns 1mm2 is typical near the center of the eye. We shall model the eye as a sphere 2.50 cm in diameter with a single thin lens at the front and the retina at the rear, with light receptor cells 5.0 mm in diameter. (a) What is the smallest object you can resolve at a near point of 25 cm? (b) What angle is subtended by this object at the eye? Express your answer in units of minutes (1° = 60 min), and compare it with the typical experimental value of about 1.0 min.arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning