51 flint glass dependent on type 186000 161 diamond

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: . The frequencies of light are in the range of 1015 Hz. Light spreads in a straight line. A consequence of this statement lies in the formation of a shadow. A pin sized light source produces a core shadow. In the case of extended (or several pin sized) light sources, core and half-shadows are superimposed. Light beams, which radiate from one point, are divergent (the beam cross-section increases as the distance grows). Beams which focus on one point are convergent (the beam cross-section decreases towards the crossover point). Beams without a common output or point of direction are known as diffuse. 186 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals The speed of light in a vacuum is roughly 300,000 km/s. The table below lists some values for the speed of light in respect of different materials. Medium v [km/s] Refractive index Vacuum 300,000 1 Air 300,000 1.0003 Water 225,000 1.33 Crown glass (Dependent on type) 198,000 1.51 Flint glass (Dependent on type) 186,000 1...
View Full Document

Ask a homework question - tutors are online