Reflecting layer Lens, Retina FIGURE V.2

University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter4: Diffraction
Section: Chapter Questions
Problem 78P: The first-order Bragg angle for a certain crystal is 12.1°. What is the second-order angle?
icon
Related questions
icon
Concept explainers
Question

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 individual
eyes are quite small. A typical scallop has 40 to 60 eyes, each with a 450-mm–diameter pupil and a reflecting surface at the back of the eye with a focal length of only 200 mm. The unusual imaging system of the scallop eye makes it very sensitive to light. The ratio of the focal length to the aperture of an optical system is known as the f-number. A smaller f-number implies greater light sensitivity. A telescope optimized for light gathering might have an f-number of 4; the scallop’s f-number of less than 0.5 means that its small eyes work well in very dim light.

Consider the reflection of light from the front and back faces of the guanine crystals. What is the number of reflective phase changes?
A. 0
B. 1
C. 2

 

Reflecting
layer
Lens,
Retina
FIGURE V.2
Transcribed Image Text:Reflecting layer Lens, Retina FIGURE V.2
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps

Blurred answer
Knowledge Booster
Lens
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
University Physics Volume 3
University Physics Volume 3
Physics
ISBN:
9781938168185
Author:
William Moebs, Jeff Sanny
Publisher:
OpenStax
College Physics
College Physics
Physics
ISBN:
9781938168000
Author:
Paul Peter Urone, Roger Hinrichs
Publisher:
OpenStax College
Inquiry into Physics
Inquiry into Physics
Physics
ISBN:
9781337515863
Author:
Ostdiek
Publisher:
Cengage
Physics for Scientists and Engineers, Technology …
Physics for Scientists and Engineers, Technology …
Physics
ISBN:
9781305116399
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning