Question
Asked Dec 25, 2019
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A periscope (Fig. P23.5) is useful for viewing objects that
cannot be seen directly. It can be used in submarines and
when watching golf matches or parades from behind a
crowd of people. Suppose the object is a distance p1 from
the upper mirror and the centers of the two flat mirrors are
separated by a distance h. (a) What is the distance of the
final image from the lower mirror? (b) Is the final image
real or virtual? (c) Is it upright or inverted? (d) What is its
magnification? (e) Does it appear to be left–right reversed?

Figure P23.5
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Figure P23.5

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Expert Answer

Step 1

(a)

The flat mirrors have its radius of curvature and focal length is infinity,

The upper mirror produces a virtual, actual sized image,

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f →∞ P 41 Pi I1 =-Pi

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Step 2

The magnification of the lower mirror is,

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Mq = P1 P1 Pi = +1

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Step 3

As shown, this image is on the upper mirror. It is the object for mirror M2...

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P2 = P1 +h 1. 1 0 = P2 I2 I2 = -P2 =-(P, + h)

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Science

Physics

Ray Optics