Subject	concave mirror
Predicate	can produce
Object	virtual image
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.9067
Neighborhood Sigma	0.9101
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source a concave mirror can produce a virtual image 5 Google Autocomplete, Answers.com Questions