Question

write an activity to find on which factors does the focal length of lens depend
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Answer 1

Answer:

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The focal length of a lens is depended on the surrounding medium. The reason behind this phenomenon is that the angle of refraction of a lens is depended on the indices of refraction of the medium of lens and the incoming medium and the difference in their indices.

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Answer 2

When the lens is dipped to a height which is greater than the focal length of lens in air ,we are able to see the image .conclude:by this experiment we can conclude the focal length of lens depend upon surrounding medium.the focal length of the lens is a dependent upon surrounding medium.