If a concave mirror of focal length 10cm is immersed in water, its foc

1.	If a concave mirror of focal length 10cm is immersed in water, its focal length will ________.
A.	Be reduced
B.	Be increased
C.	Remain unchanged
D.	Change sign
Answer» D. Change sign

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If a concave mirror of focal length 10cm is immersed in water, its focal length will ________.

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