Wright, Mark R., 1854- · London : Longmans · leaf 124
The spot of light is Fig. 96. on a screen. Behinxi the hole place a prism with the refractingedge horizontal! and parallel to the screen,moved to b, and by join-ing these two positionswith the hole, the angleof deviation is practi-cally found. Remove the objec-tives and condensersfrom the lantern,… … Fig. 97. the spot moves towards the base of the prism, and the direction ofthe ray makes an angle with its former direction. If you place a similar wedge base to base, the displacementof the spot of light increases. If they be arranged so as to forma plate, the emergent ray may be slightly…
Physics
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