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- Title: Fourth Lecture (First Scientific Lecture-Course)
- study such a phenomenon quite exactly. Suppose I have two mirrors and
- get pictures by means of the one mirror and also pictures by means of
- the other mirror. Such is the distribution you are to assume; I draw
- mirrors, set at a very small angle to one another, — here is a
- light strike here, with the help of this mirror I can illumine this
- region. Now I have here a second mirror, by which the light is
- reflected from here below (from the second mirror) on to the screen,
- still falls into the upper part. The inclination of the two mirrors
- upper mirror and by reflection from the lower. It will then be as
- bombards the first mirror, hurling its little cannon-balls in this
- direction. After recoiling from the mirror they reach the screen and
- mirror, for many of them go in that direction also. It will be very
- much lighter on the screen when there are two mirrors than when there
- is only one. Therefore if I remove the second mirror the screen will
- surely be less illumined by reflected light than when the two mirrors
- mirrors. The velocity of light — nay, altogether what arises
- of the two mirrors, is vibrating, say, in this way and impinges here.
- Title: Ninth Lecture (First Scientific Lecture-Course)
- Figure IXb — were a source of light and here a mirror. A
- second mirror, and an image arises here. We may then say, the light
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