Question

A convenient store mounts a convex mirror in the corner of the store to serve as a security mirror. When Robin is positioned a distance of 4.8 m from the mirror, his image is magnified by a factor of one-half. Determine the focal length of the mirror.

Answer 1

Answer:

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.