Elementary Lessons in Heat, Light & Sound |
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Page 150
... focus of the mirror , and the distance dF ( from the mirror to the principal focus ) is called the principal focal distance or focal length of the mirror . Clearly the focal length is one - half the radius of curvature . we denote the focal ...
... focus of the mirror , and the distance dF ( from the mirror to the principal focus ) is called the principal focal distance or focal length of the mirror . Clearly the focal length is one - half the radius of curvature . we denote the focal ...
Page 152
... focal length ƒ of the mirror is equal to Hence 2 I == 2 r f ' and equation ( 2 ) becomes I I + Β ' Β ' I - ( 3 ) 29 ... focus at the point P ' . P ' is the image of P in the mirror . Conversely , if P ' were a luminous point , P would be ...
... focal length ƒ of the mirror is equal to Hence 2 I == 2 r f ' and equation ( 2 ) becomes I I + Β ' Β ' I - ( 3 ) 29 ... focus at the point P ' . P ' is the image of P in the mirror . Conversely , if P ' were a luminous point , P would be ...
Page 153
... focus . Notice that parallel rays may be regarded as proceeding from a point at an ... focal distances , beginners will find it well to follow strictly some such ... length , p the distance of the object , and the distance of the image ...
... focus . Notice that parallel rays may be regarded as proceeding from a point at an ... focal distances , beginners will find it well to follow strictly some such ... length , p the distance of the object , and the distance of the image ...
Page 154
... focus F , which is also to the right hand of the mirror . The focal length of a convex mirror is negative : this we shall consider in due course . IV . Whenever you have to work out any optical calculation , begin by writing down the ...
... focus F , which is also to the right hand of the mirror . The focal length of a convex mirror is negative : this we shall consider in due course . IV . Whenever you have to work out any optical calculation , begin by writing down the ...
Page 160
... focus . Measure the distance from the image to the mirror ; this is the focal length . Hold your hand so that the image is formed on the back of it ; the spot is uncomfortably hot . Not only the light , but also the heat - radiation ...
... focus . Measure the distance from the image to the mirror ; this is the focal length . Hold your hand so that the image is formed on the back of it ; the spot is uncomfortably hot . Not only the light , but also the heat - radiation ...
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Common terms and phrases
A. W. VERRALL amount of heat angle of incidence Assistant Master beam boiling boiling-point BOOK bulb Cambridge candle centimetres CHEMISTRY coefficient coloured concave lens concave mirror condensation convex lens cooling cork distance diverge Edited ELEMENTARY English equal equation expansion experiment EXPT FASNACHT Fcap flame flask focal length front G. E. FASNACHT GEOMETRY grammes GREEK HISTORY Illustrated image is formed inches incident ray increases interval ISAAC TODHUNTER latent heat LATIN lenses liquid LL.D Mathematics melt mercury observer Owens College paper passes placed position pressure principal axis principal focus prism produced Prof Professor pulse radiation rarefaction ray of light real image reflected refracted ray revised School screen shown in Fig side sound source of light specific heat steam string surface T. H. HUXLEY temperature thermometer Translated TREATISE Trinity College University velocity vibration vibration-number volume water-vapour wire
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