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What magnification would a lens with a power of –4.00 D (typical for correcting myopia) produce if an object is held 25 cm away? -0.5 +0.5 -0.4 +0.4

Question

What magnification would a lens with a power of –4.00 D (typical for correcting myopia) produce if an object is held 25 cm away?

  • -0.5
  • +0.5
  • -0.4
  • +0.4
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Solution

The magnification (m) of a lens can be calculated using the formula:

m = -D * d

where: D is the power of the lens (in diopters), and d is the distance the object is held from the lens (in meters).

First, convert the distance from cm to m:

25 cm = 0.25 m

Then, substitute the given values into the formula:

m = -(-4.00 D) * 0.25 m = 1

So, the magnification produced by the lens would be +1. However, this option is not listed in your choices. Please check the question or the choices again.

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