First Lessons on Natural Philosophy for Children by Mary A. SwiftFirst Lessons on Natural Philosophy for Children by Mary A. Swift

First Lessons on Natural Philosophy for Children

byMary A. Swift

Paperback | February 6, 2012

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1841. Excerpt: ... LESSON TWENTY-FOURTH. Into how many colors may light be separated? Light may be separated into seven colors. What are the names of these colors? Violet, indigo, blue, green, yellow, orange, red. When light shines upon a sheet of paper, how can you see the paper 1 By the light which the paper reflects or throws bach to my eyes. Would the paper reflect all the light that shines upon it? If it was white paper, it would. How do you know that white paper reflects all the light that falls upon it? Because it takes all the seven colors to make white light, and the paper looks white, which it could not do, if it did not reflect all the seven colors. How do you know that it takes all the seven colors to make white? Because, if you separate a ray of light by a prism, it will be changed into just seven colors, and no more; and if you bring all these seven colors together again, they will be changed to a ray of white light. Do all bodies reflect all these colors? They do not; some reflect one color, and some another. What becomes of those colors which the body does not reflect? That body absorbs them. What do you mean by a body's absorbing colors? It seems to take them into itself, so that we cannot see them. If a body should absorb all the colors and reflect none, what color would it have? It would not have any color. Then what should we call it 1 We should call it a black body. Then is black a real color 1 It is not. Then when we say a body is black, what do we mean? We mean that the body has no color. And when we say a body is white, what do we mean? That it has all the seven colors. If it absorbs all the colors but the red, and reflects the red, of what color will the body be? It will be a red body. What color shall we call it, if it reflects the green, and absor...
Title:First Lessons on Natural Philosophy for ChildrenFormat:PaperbackDimensions:24 pages, 9.69 × 7.44 × 0.05 inPublished:February 6, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217476414

ISBN - 13:9780217476416