Find the focal length of a thin plano-convex lens. The front surface of this lens is flat, and the rear surface has a radius of curvature of \(R_{2}=-35 \mathrm{~cm}\). Assume that the index of
refraction of the lens is 1.5.
Text Transcription:
R_2=-35 cm
Week 8 ● Notes: Ch 10 cont. ○ Brightness ■ Luminosity ● Expressed in terms of solar luminosity ○ 1L ○ Most luminous stars are 10ˆ6 L ○ Least luminous stars are 10ˆ- 4L ○ Low luminosity stars are more common ○ What is matter ■ Atomic terminology ● Atomic number ○ Number of protons in nucleus ● Atomic mass number ○ Number of protons plus numbers of neutrons ■ Example ● Hydrogen ○ ˆ1 H ■ Atomic number = 1 ■ Atomic mass number = 1 ● Isotope ○ Same number of protons but different number of neutrons ● Molecules ○ Consist of two or more atoms ○ Composition ■ Energies ● Electrons can only have certain energies ○ Some not allowed ● Each type of atom has a unique set of energies ○ Typically illustrated with an energy level diagram ● Energy state ○ Lowest energy = ground state ○ Energy above ground state = excited states ○ Atoms can go from 1 level to another, but can not be in between le
