'Big circles' diaporamas de présentation

Spain We want to find out about Spanish food and set up a travel agency in class.

292 views • 18 slides

Wavelength & Frequency

If you are making a mirror for a big telescope (that uses visible light), how smooth should the glass be? In other words, irregularities in the glass should be no larger than (approximately!): a) 1 mm (10 -3 m) b) 1 nm (10 -9 m) c) 1 fm (10 -15 m) d) there can be no irregularities at all.

394 views • 15 slides