Engineers are testing a new thin-film coating whose index of refraction is less than that of glass. They deposit a 560-nmnm-thick layer on glass, then shine lasers on it. A red laser with a wavelength of 640 nmnm has no reflection at all, but a violet laser with a wavelength of 400 nmnm has a maximum reflection. How the coating behaves at other wavelengths is unknown.

Rohit is trying to tune an instrument

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)