Answer: CONCAVE

Possible questions:


Like some lenses we know 5 Answers
Inverted we know 5 Answers
The vault of the sky we know 1 Answer
Like the inside of a sphere we know 1 Answer
Like the inside of a bowl we know 1 Answer
Like part of a circle we know 1 Answer
Like band shells we know 1 Answer
Like a bowl we know 1 Answer
Lens shape we know 1 Answer
Curving inward we know 1 Answer
Curved and hollow we know 1 Answer

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