Ray Optics: Refraction and Lenses

Refraction and Lenses: Audio Guided Solution

Problem 25:

The focal point of a lens is located 17.8 cm away from its surface. The lens produces a virtual image which is 38.9 cm from the lens. Determine the object distance.

Audio Guided Solution

Habits of an Effective Problem Solver

  • Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
  • Identify the known and unknown quantities and record them in an organized manner. Equate given values to the symbols used to represent the corresponding quantity - e.g., do = 24,8 cm; di = 16.7 cm; f = ???.
  • Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
  • Identify the appropriate formula(s) to use.
  • Perform substitutions and algebraic manipulations in order to solve for the unknown quantity.

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Get more information on the topic of Refraction and Lenses at The Physics Classroom Tutorial.

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