In attempting to discern distant details, people will sometimes squint. Why does this help?
Step 1 of 2
The size of the opening of the "stop" is specified by the f -number or f-stop. The f-number can be defined as,
Where the focal length is f and the diameter of the lens opening is D.
Stepping down a lens to a larger f-number indicates a small opening of the lens and the light rays which are coming through the central part of the lens are only accepted.
Textbook: Physics: Principles with Applications
Author: Douglas C. Giancoli
The answer to “In attempting to discern distant details, people will sometimes squint. Why does this help?” is broken down into a number of easy to follow steps, and 14 words. This full solution covers the following key subjects: attempting, details, discern, distant, help. This expansive textbook survival guide covers 35 chapters, and 3914 solutions. The full step-by-step solution to problem: 7Q from chapter: 25 was answered by , our top Physics solution expert on 03/03/17, 03:53PM. This textbook survival guide was created for the textbook: Physics: Principles with Applications, edition: 6. Physics: Principles with Applications was written by and is associated to the ISBN: 9780130606204. Since the solution to 7Q from 25 chapter was answered, more than 387 students have viewed the full step-by-step answer.