In optical instrument, the lenses are used to form image by the phenomenon of

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Q: 72 (NDA-I/2014)
In optical instrument, the lenses are used to form image by the phenomenon of
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,35,33,24,35,8,1

keywords: 

{'optical instrument': [0, 0, 0, 1], 'lenses': [0, 0, 1, 2], 'refraction': [0, 0, 1, 0], 'reflection': [1, 1, 2, 19], 'image': [0, 1, 3, 23], 'diffusion': [4, 1, 4, 12]}