The correct answer would be D
Answer:
0.125 cm
Explanation:
1/f = 1/d¡ + 1/d。
Find the focal point
(13.0^-1 + 20.8^-1) = 0.125 m
Focal point = 0.125 m
Salt is a substance because a substance is a material that has constant composition regardless of its source. Salt is the only option that matches this description
That's a not-bad description of a capacitor.
