Assertion: telescope's objective | /r/CapableOf | form image
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Source sentences:
text: A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).
text: A refracting or refractor telescope is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).
text: A refractor telescope is a type of optical telescope that uses a lens as its objective to form an image (also referred to as a dioptric telescope).