Question

a glass lens of focal length 80 cm in air is submerged in oil. how will submerging the lens in oil affect the focal length of the lens and why?

Answer 1

Answer:

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Explanation:

When submerged in water, the light will not refract as much passing through the lens, because the speed of the light will not change as much traveling from oil to glass as it did traveling from air to glass. This will move the focal point farther from the lens. In fact, if the oil has the same index of refraction as the glass, light will not change direction as it passed through the lens, because it did not change speed passing through the lens.

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Answer 2

Answer:

f > 80 cm because there is now a smaller change in velocity as light passes from oil into the glass.

Explanation:

-When submerged in water, the light will not refract as much passing through the lens, because the speed of the light will not change as much traveling from oil to glass as it did traveling from air to glass. This will move the focal point farther from the lens. In fact, if the oil has the same index of refraction as the glass, light will not change direction as it passed through the lens, because it did not change speed passing through the lens.

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