In musical language, mezzo forte (mf) signals that the music's volume should be
a. soft.
b. medium soft.
c. very loud.
d. medium loud.

concave lenses are used here. they spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina. hyperopia is known to you probably as farsightedness.

the higher the current the higher the mag field around it the higher the influence on the compass