A laser beam with a wavelength of illuminates two -wide slits separated by . The interference pattern is observed on a screen behind the slits. What is the light intensity, as a fraction of the maximum intensity , at a point halfway between the center and the first minimum?
The strength or amount of light produced by a certain lighting source is referred to as light intensity. It is a power measurement of a light source that is wavelength-weighted..
The following equation gives the total double-slit intensity:
We must first locate the midway point between the center and the first minimum in order to find as a function , To do so, we can use the following equation to explain the position of dark fringes:
The first minimum's position is
And the halfway point is at half of this number, implying that
Substitute the values,
A helium-neon laser is built with a glass tube of inside diameter , as shown in FIGURE P33.62. One mirror is partially transmitting to allow the laser beam out. An electrical discharge in the tube causes it to glow like a neon light. From an optical perspective, the laser beam is a light wave that diffracts out through a -mm-diameter circular opening.
a. Can a laser beam be perfectly parallel, with no spreading? Why or why not?
b. The angle to the first minimum is called the divergence angle of a laser beam. What is the divergence angle of this laser beam?
c. What is the diameter (in mm) of the laser beam after it travels
d. What is the diameter of the laser beam after it travels ?
Two wide slits spaced apart are illuminated by blue laser light with a wavelength of . The interference pattern is observed on a screen behind the slits. How many bright fringes are seen in the central maximum that spans the distance between the first missing order on one side and the first missing order on the other side?
You've found an unlabeled diffraction grating. Before you can use it, you need to know how many lines per it has. To find out, you illuminate the grating with light of several different wavelengths and then measure the distance between the two first-order bright fringes on a viewing screen behind the grating. Your data are as follows:
Use the best-fit line of an appropriate graph to determine the number of lines per .
94% of StudySmarter users get better grades.Sign up for free