Figure 2-41. Reflection of letter F in mirror.

TM 9-258

(1) Consider two mirrors placed at 900 angles

2-21. Image Transmission by Mirror and Prism.

to one another. The light coming from the letter F falls

a. Image Transmission by Mirror.

Image

onto the reflecting surface of one of the mirrors

transmission by mirror is image reflection put to practical

(fig 2-42). Light rays from every point on the letter F are

use. The mirror is mounted so that it will transmit the

reflected by the first mirror, according to the laws of

light that falls upon it to whatever point is desired. If this

reflection, to the second mirror, and reflected again, this

cannot be accomplished with a single mirror, a second

time parallel to the original paths of the light rays. The

mirror is placed to catch the reflected light from the first

image will have been reflected a total of 180ƒ.

mirror and transmit it again.

2-29