Suppose you wanted to be able to see astronauts on the moon. what is the smallest diameter of the objective lens required to resolve a 0.67 m object on the moon? assme the wavelength of the light is near the middle of the visible spectrum: 550 nm yellow light.

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

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