Andy forms a hollow lens whose skin is very thin, strong, and transparent.  The inside of his lens is vacuum.  Which of the following is true? -The focal length of Andy's lens is infinite. -The focal length of Andy's lens is zero. -There is not enough information to determine the focal length of Andy's lens.

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Andy forms a hollow lens whose skin is very thin, strong, and transparent.  The inside of his lens is vacuum.  Which of the following is true?

-The focal length of Andy's lens is infinite.

-The focal length of Andy's lens is zero.

-There is not enough information to determine the focal length of Andy's lens.

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