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OpenStudy (anonymous):
Which of the following is employed to clearly view objects which cannot be seen directly due to obstruction ? (a) laser (b) periscope (c) kaleidoscope (d) none of these
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OpenStudy (ash2326):
periscope
OpenStudy (anonymous):
(b) periscope.
OpenStudy (anonymous):
|dw:1323440942357:dw|
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