A telescope is a usually tubular optical instrument for viewing distant objects by means of the refraction of light rays through a lens or the reflection of light rays by a concave mirror. Hence, Option B is correct. Among the rest of the options, microscope means an optical instrument used for viewing very small objects, such as mineral samples or animal or plant cells, typically magnified several hundred times, periscope means an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight ,kaleidoscope means a tube containing mirrors and pieces of coloured glass or paper, whose reflections produce changing patterns when the tube is rotated. These do not express this meaning, hence incorrect.