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1.The observer is in air nearly above the object submerged in water (index of refraction 1.33)....

1.The observer is in air nearly above the object submerged in water (index of refraction 1.33). The depth of the object is 4.5cm. Find the apparent depth of the object. (Hint: Use Snell’s law of refraction and the fact that the angles of incidence and refraction are small, so tan θ ≈ sin θ.)

2.When a diverging lens is held 10.9 cm above a line of print, the image is 3.1 cm beneath the lens. (a) Is the image real or virtual? (b) What is the focal length of the lens?

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