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Chapter 33: Problem 26
What kind of lens is used in eyeglasses to correct the vision of someone who is a) nearsighted? b) farsighted?
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Two identical thin convex lenses, each of focal length \(f\), are separated by a distance \(d=2.5 f\). An object is placed in front of the first lens at a distance \(d_{\mathrm{a}, 1}=2 f .\) a) Calculate the position of the final image of an object through the system of lenses. b) Calculate the total transverse magnification of the system. c) Draw the ray diagram for this system and show the final image. d) Describe the final image (real or virtual, erect or inverted, larger or smaller) in relation to the initial object.
A converging lens will be used as a magnifying glass. In order for this to
work, the object must be placed at a distance
a) \(d_{\mathrm{o}}>f\).
c) \(d_{\mathrm{o}}
Some reflecting telescope mirrors utilize a rotating tub of mercury to produce a large parabolic surface. If the tub is rotating on its axis with an angular frequency \(\omega,\) show that the focal length of the resulting mirror is: \(f=g / 2 \omega^{2}\).
Which one of the following is not a characteristic of a simple two-lens astronomical refracting telescope? a) The final image is virtual. b) The objective forms a virtual image. c) The final image is inverted.
Is it possible to start a fire by focusing the light of the Sun with ordinary eyeglasses? How, or why not?
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