Which one of the following is the natural phenomenon based on which a simple periscope works ?

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Q: 11 (NDA-I/2018)

Which one of the following is the natural phenomenon based on which a simple periscope works ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,27,34,27,15,3,16

keywords: 

{'simple periscope works': [0, 0, 0, 1], 'reflection': [1, 1, 2, 19], 'natural phenomenon': [0, 0, 0, 1], 'refraction': [0, 0, 1, 0], 'total internal reflection': [0, 1, 2, 1], 'dispersion': [0, 0, 1, 16], 'light': [16, 4, 34, 62]}