To distinguish hill and valley one surface of optical flat is lightly – McqOptions

MCQOPTIONS

1.	To distinguish hill and valley one surface of optical flat is lightly pressed. Which of the following option is for the valley?$
A.	Number of fringes increases
B.	Fringes move apart
C.	Fringes brought closer
D.	Centre of fringes is displaced
Answer» C. Fringes brought closer

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