Olga is nearsighted and cannot see things beyond 90 cm cm from her eyes. What is the refractive power of the contact lenses that will enable her to comfortably see distant buildings clearly?
A) +1.1 diopters
B) -1.1 diopters
C) -1.7 diopters
D) -2.2 diopters
E) +2.2 diopters
B
You might also like to view...
A cube of copper 0.10 meters on each side has an average grain size of 10 × 10-6 m. The average grain boundary energy of copper is 625 × 10-3 J/m2 . Assume that all of the grains are cubes 10 × 10-6 m across.
Reaction forces are given in the figure below for beam ABCDE. The bending moment at C (in kN?m) is:
(A) 0.84 kN?m
(B) 0.96 kN?m
(C) 1.04 kN?m
(D) 1.36 kN?m
The kind of molecular motion that mostly relates to the temperature of a substance is
A) translational motion. B) rotational motion. C) vibrational motion. D) all about equally
The cosmic background radiation appears compatible with a blackbody source at what temperature?
a. 0.000 3 K b. 0.03 K c. 3 K d. 300 K