Advertisement II.

IN this Second Edition of thefe Opticks I have o-Tracts publifb'd at the End of the Former Edition, as not be-longing to the Subject.

And at the End of the Tbird Book I bave added fome 2ueftions.

And to Fbew that I do not Take Gravity for an Effential Property of Bodies, I have added one 2ueftion concerning its Caufe, cbufing to propofe it by way of a 2ueftion, becaufe I am not yet fatisfied about it for want of Experiments.

July 16.

1717. I. N.

ERRATA.

Pap. 342. Lin. 6. For feven, read feven and 4 half. Ib. Lin. 8. For 14, read 15, Ib. Lin. 10, for 21, 28, or 35, read 22.50 , 30 or 38. Ib .lin. 21. For 70 , 140, 210 . Read 76, 152, 228. Pag. 366. I. 22. For beigbi read diftavce.

THE

FIRST BOOK

OPTICKS.

P A R T I

M Y Defign in this Book is not to Explain the Properties of Lighr by Hypothefes, but to propofe and prove them by Reafon and Experiments: In other to which I fhall permife the following Definitions and Axioms.

B DEFI-

Comments

Albert Einstein

Imagination may be a ton of important than info. Insanity: doing identical issue over and every one yet again and expecting utterly completely different results. Albert Einstein If you can't justify it just, you are doing not understand it tolerably. Life is like riding a bicycle. To keep your balance you would like to stay moving. Imagination is everything. it is the preview of life's returning attractions. Coincidence is God's methodology of remaining anonymous. In the middle of issue lies probability. The important issue is not to stop questioning. Two things unit of measurement infinite: the universe and human stupidity, and that i am undecided regarding the universe. Try to not become an individual of success, but rather conceive to become an individual central.

Albert Einstein Quotes About Education

German Physicist Albert Einstein is known for being a genius and his name is even a moniker for a brilliant person (or in sarcasm, a less than brilliant person). He is famous for his Theory of Relativity as well as intellectual inventions like E=MC2. Many think of him as the father of modern physics and one of the more intelligent people in recent history. His brilliance is an inspiration to the scientific and educational communities alike. Being an academic, he gave some good insight into the education process. 1 ,....“ Education is what remains after one has forgotten what one has learned in school .” 2,..Reading, after a certain age, diverts the mind too much from its creative pursuits.” 3,...Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.”

AXIOMS

[ 5 ] A X. I. T B E Angles of Reflexion, and Refraction, lie one and additionally the celebrity Plane with the Angle of Incidence. A X. II. The Angle of Reflexion is up to the Angle of Incidence. A X. III. If the Refracted Ray be came back directly back to the aim of Incidence, it fball be re-fracted into the road before defcribed by the in-cident Ray. A X. IV. Refraction out of the rarer Medium into the denfer, is made towards the Perpendicular, that is, of that the Angle of Refraction be lefs than the Angle of Incidence. A X. V. The mathematical function of Incidence is eitber accurately or really nearly terribly} very given relation to the mathematical function of Re-fraction. wherefrom if that Proportion be acknowledged in anybody Inclination of the incident Ray, 'tis acknowledged in all the Inclinations, and thereby the Refra-ction in all cafes of Incidence on the celebrity refra-cting Body may even be determined. therefore if the Refra-

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