Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 266
observe that, as in the last experiment, the part ofthe shadow around the edges is much lighter than that nearerthe centre. To understand the reason of this, prick a pin-hole NATURE AND PROPAGATION OF LIGHT. 257 in the screen (1) in the darkest part near the centre, (2) onthe line between the dark… … Fig. 200. 1! In which case can (1) the whole flame, (2) a part of the flame,(3) the edge of the flame, (4) no part of the flame, be seen ? 2. How, therefore, do you account for the difference in thedegree of darkness of the different parts of the shadow 1 The dark portion of a shadow which receives…
Physics
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