A common optical instrument in a laser laboratory is a beam expander. One type of beam expander is shown in FIGURE P35.29.
The parallel ray of a laser beam of width enter from the left.
a. For what lens spacing d does a parallel laser beam exit from the right?
b. What is the width of the exiting laser beam?
a.)From the given values shown in FIGURE
If this equation to
b.) we need to find width
From triangles picture, we get Value of
So, if is and our answer then shows is
Your task in physics laboratory is to make a microscope from two lenses. One lens has a focal length of 2.0 cm, the other 1.0 cm. You plan to use the more powerful lens as the objective, and you want the eyepiece to be 16 cm from the objective.
a. For viewing with a relaxed eye, how far should the sample be from the objective lens?
b. What is the magnification of your microscope?
The Hubble Space Telescope has a mirror diameter of 2.4 m. Suppose the telescope is used to photograph stars near the center of our galaxy, 30,000 light years away, using red light with a wavelength of 650 nm.
a. What’s the distance (in km) between two stars that are marginally resolved? The resolution of a reflecting telescope is calculated exactly the same as for a refracting telescope.
b. For comparison, what is this distance as a multiple of the distance of Jupiter from the sun?
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