# Ray Optics: Reflection and Mirrors

## Reflection and Mirrors: Audio Guided Solution

#### Problem 12:

A magician places a 68.3-mm tall light bulb a distance of 130.2 cm from a spherical concave mirror with a focal length of 65.1 cm.
• Determine the image distance (in cm). Enter a - answer if appropriate.
• Determine the image distance (in cm). Enter a - answer if appropriate.
• The image is _______.  (upright or inverted)
• The image is _______. (real or virtual)

## Audio Guided Solution

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## 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 in an organized manner. Equate given values to the symbols used to represent the corresponding quantity - e.g., do = 24.2 cm; di= 16.8 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.