A nearsighted person has a near point of 12. cm and a far point of 17. cm. If the lens is 2.0 cm from the eye: (a) what lens power will enable this person to see distant objects clearly? (b) what then will be the new near point?
What will be an ideal response?
(a) -6.7 D
(b) 30. cm in front of the lens
You might also like to view...
It is believed that a giant impact may have taken away some of Mercury's low-density crustal rock and left a small, dense world with a(n) large, dense, and _______________ core
Fill in the blank(s) with correct word
Size of the Nucleus: The radius R of a nucleus of mass number A is given by R = R0 A1/3, where R0 = 1.2 × 10-15 m, calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10-27 kg.
Fill in the blank(s) with the appropriate word(s).
A resistance of 55. ?, a capacitor of capacitive reactance 30. ?, and an inductor of inductive reactance 30. ? are connected in series to a 110. V, 60. Hz power source. What current flows in this circuit?
A) 2. A B) less than 2. A C) more than 2. A but less than 4. A D) more than 4. A E) 4. A
What is the force that keeps planets orbiting the Sun and moons orbiting planets?
a. weight b. inertia c. mass d. gravity