Question

Which of the following is not a scientific optical instrument a)microscope b)perescope c)endoscope d)telescope

Answer 1

b) periscope
because it used in submarines to look above water


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Answer 2

The Correct Answer would be : Option B--- Periscope.

Reason :
All the options given like microscope , Telescope, Periscope and endoscope are optical instruments which uses the properties of light like reflection, refraction etc.

But for scientific purpose --- That is for systematic investigation and studies related we don't use periscope,.
Periscope is used in submarines to see what is going on the water surface.It is used for observation purpose in military for locating enemies during war.