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1.) A lens is constructed using glass for which the index of refraction is 1.50 and...

1.) A lens is constructed using glass for which the index of refraction is 1.50 and when placed in air it has a focal length of 48 mm. Suppose the lens is placed in water. Does the focal length remain the same or change? If it changes, describe whether it is larger than or smaller than 48 mm. Explain your answer.

2.) A projector uses a convex lens to form an image of an object that is 4.0 cm tall. The image is 1.2 m tall. The distance from the lens of the screen is 3.0 m. Determine the focal length of the lens needed to do this.
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