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What is the total power of two lenses of power +5 D and -3 D placed in contact?

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Question: What is the total power of two lenses of power +5 D and -3 D placed in contact?

Options:

  1. 2 D
  2. 8 D
  3. 15 D
  4. 1 D

Correct Answer: 2 D

Solution: 

Total power P = P1 + P2 = 5 D - 3 D = 2 D.

What is the total power of two lenses of power +5 D and -3 D placed in contact?

Practice Questions

Q1
What is the total power of two lenses of power +5 D and -3 D placed in contact?
  1. 2 D
  2. 8 D
  3. 15 D
  4. 1 D

Questions & Step-by-Step Solutions

What is the total power of two lenses of power +5 D and -3 D placed in contact?
  • Step 1: Identify the power of the first lens, which is +5 D.
  • Step 2: Identify the power of the second lens, which is -3 D.
  • Step 3: Write down the formula for total power when lenses are in contact: Total power P = P1 + P2.
  • Step 4: Substitute the values into the formula: P = 5 D + (-3 D).
  • Step 5: Simplify the equation: P = 5 D - 3 D.
  • Step 6: Calculate the result: P = 2 D.
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