Question

2-8. Compute the divergence angle of a Gaussian beam of wavelength 0.8 um and spot size mm. f this beam is aimed at the moon, what is its spot size on the moon's surface? (The distance between the earth and the moon is 3.8 x 10* m.) What is its spot size at distances of 1 km and 10 km? 2-9. A 6,000-km undersea glass fiber tele phone line crosses the Atlantic ocean connecting the United States and France. (a) How long does it take for a message to traverse this link? (b) How long does it take for a message to travel from the United States to France by us- ing a satellite link? The satellite is sta tioned about 22,000 miles above the earth between the United States and France. (c) Will two people having a conversation across these two different links notice the travel delays?

please solve both

Answer 1

2.8 -テ!w. 77 W -지、a), l+ 04,med in moon, distan c e ber n rthe earth K㈦e moon mis SPot Size