   Chapter 27, Problem 59PE

Chapter
Section
Textbook Problem

Diffraction spreading for a flashlight is insignificant compared with other limitations in its optics, such as spherical aberrations in its mirror. To show this, calculate the minimum angular spreading of a flashlight beam that is originally 5.00 cm in diameter with an average wavelength of 600 nm.

To determine

The minimum angular spreading of a flashlight beam that is originally 5.00 cm in diameter with an average wavelength of 600 nm if diffraction spreading for a flashlight is insignificant compared with other limitations in its optics, such as spherical aberrations in its mirror?

Explanation

Given info:

λ=600nm=6×107mD=5cm=5×102m

Formula used:

Angle,

θ=1.22λD , λ is the wavelength and D is the diameter of the aperture, lens, mirror etc.

Calculation:

We have,

θ=1

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