Author Question: A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of ... (Read 53 times)

michelleunicorn · **on:** Jul 29, 2018

A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?

A) infinite B) -30 cm C) 18 cm D) 38 cm E) -19 cm

Question 2

A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second?

(h = 6.626 10-34 J s, c = 3.00 108 m/s)
A) 1.3 1016 B) 6.7 1015 C) 8.8 1015 D) 1.1 1016