203

Principles of reflection.

OF THE WAY IN WHICH THE SHADOWS CAST BY OBJECTS OUGHT TO BE DEFINED.

If the object is the mountain here figured, and the light is at the point a, I say that from b d and also from c f there will be no light but from reflected rays. And this results from the fact that rays of light can only act in straight lines; and the same is the case with the secondary or reflected rays.

Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.

Notebooks of Leonoardo da Vinci

III: Six books on Light and Shade.

. . .

Further complications in the derived shadows.

183,

184,

185,

186,

On the shape of the cast shadows.

188,

189,

190,

On the outlines of cast shadows.

192,

193,

194,

On the relative size of shadows.

196,

Effects on cast shadows by the tone of the back ground.

A disputed proposition.

On the relative depth of cast shadows.

200,

201,

Principles of reflection.

203,

On reverberation.

Reflection on water.

206,

Experiments with the mirror.

208,

209,

Appendix:--On shadows in movement.

211,

The effect of rays passing through holes.

213,

On gradation of shadows.

On relative proportion of light and shadows.

216,

217,

218,

219,

220,

. . .