Vision Problems: A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses must he use in his contact lenses to allow him to focus on very distant mountains?

A. -4.2 m
B. 4.2 m
C. -5.2 m
D. 5.2 m
E. -4.8 m


Answer: A

Physics & Space Science

You might also like to view...

Consider the motion of a 1.00-kg particle that moves with potential energy given by U(x) = (-2.00 J ? m)/x + (4.00 J ? m2)/x2. Suppose the particle is moving with a speed of 3.00 m/s when it is located at x = 1.00 m

What is the speed of the object when it is located at ? A) 2.13 m/s B) 3.00 m/s C) 4.68 m/s D) 3.67 m/s

Physics & Space Science

The transmitted intensity of an unpolarized beam of light passing through a polarizer is one half of the value of the original intensity

Indicate whether the statement is true or false

Physics & Space Science

If a quantity is conserved, it means that it

Choose one: A. can be saved for a later time. B. changes only if an external force acts. C. changes only if an internal force acts. D. it doesn't change.

Physics & Space Science

If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n, then

A) its radius and binding energy will double. B) its radius will quadruple and the binding energy will double. C) its radius will double and the binding energy will quadruple. D) its radius will quadruple and the binding energy will be reduced by a factor of four. E) its radius and binding energy will quadruple.

Physics & Space Science