Ray Optics: Refraction and Lenses

Refraction and Lenses: Audio Guided Solution

Problem 19:

During a lens lab, Jerome and Michael placed a 4.5-cm tall night light bulb a distance of 42.8 cm from a lens. The image of the light bulb was inverted and appeared 26.5 cm from the lens.
a. Determine the focal length of the lens being by Jerome and Michael.
b. Determine the expected height of the image of the bulb.

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., d_o = 24,8 cm; d_i = 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.

Read About It!

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

• Object-Image Relationships for Converging Lenses
• The Mathematics of Lenses

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