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1- An object of 5 cm in height is 40 cm from a converging lens. It...

1- An object of 5 cm in height is 40 cm from a converging lens. It produces an inverted image which is found 30 cm from the lens. Find a) the focal length of the lens, b) the magnification, and c) the image height.

2-A laser of 632.8 nm (red) is incident on a rectangular glass container filled with water. Assume the glass is thin enough that we ignore the refraction it causes and only focus on the water. If the water has some impurities such that its index of refraction is 1.4, a) calculate the wavelength of the light inside the water, b) what color in the visible E&M part of the spectrum is this found, and c) if you view this experiment by standing over the table and looking at the water from above, the laser light still appears red. Why?

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