A singer is farsighted and cannot see objects clearly that are closer than 80.0 cm from his unaided eye. What is the refractive power of the contact lenses that will move his near point to a distance of 25.0 cm from his eye?
A) 2.75 diopters
B) -2.75 diopters
C) -4.72 diopters
D) 4.72 diopters
E) 7.00 diopters
A
You might also like to view...
Which represents the velocity as a function of time for a ball which is dropped (consider only the time until just before it hits the ground)?
A. 
B. 
C. 
D. 
A wire of resistivity ? must be replaced in a circuit by a wire of the same material but 4 times as long. If, however, the resistance of the new wire is to be the same as the resistance of the original wire, the diameter of the new wire must be
A) the same as the diameter of the original wire. B) 1/2 the diameter of the original wire. C) 1/4 the diameter of the original wire. D) 2 times the diameter of the original wire. E) 4 times the diameter of the original wire.
In a Young's double slit experiment, the slit separation is made to be exactly 4?
At what angle will the third bright fringe to the side of the central fringe occur? Caution: the angles involved are such that the approximation sin? ? ? is not valid. A) 48.6° B) 75.0° C) 67.5° D) 36.9° E) 43.0°
Which of the following is not a terrestrial planet?
a. Earth b. Mars c. Saturn d. Venus