Why is it so difficult to see both (a) when you first enter a darkened theater from a sunlit street, and (b) when you step out onto a sunlit street from a darkened theater?

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The Answer of Why is it so difficult to see both (a) when you first enter a darkened theater from a sunlit street, and (b) when you step out onto a sunlit street from a darkened theater?

Why Is It So Difficult to See Both (A) When