APFIVE Concave Mirror Focal Length in a Medium
A student measures that light rays parallel to the principal axis of a concave mirror converge at a point 25 cm from the mirror. Later, the mirror is immersed in water (n=1.33). What is the new focal length?
A
25 cm
B
18.8 cm
C
33.25 cm
D
25/1.33 cm
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