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From Karnataka Open Educational Resources
→Useful websites
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[http://en.wikipedia.org/wiki/Optical_instrument Wikipedia for Optical Instruments]<br>
[http://en.wikipedia.org/wiki/Optical_instrument Wikipedia for Optical Instruments]<br>
[http://physics.bu.edu/~duffy/py106/Instruments.html Use of an Optical Instruments]
[http://physics.bu.edu/~duffy/py106/Instruments.html Use of an Optical Instruments]
+[https://en.wikipedia.org/wiki/Binoculars Binoculars]
+[https://en.wikipedia.org/wiki/Microscope Microscope]
+[https://en.wikipedia.org/wiki/Telescope Telescope]
==Reference Books==
==Reference Books==
