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Power of lens
P = 1/f (in m)
Where: P = power (W) / pressure (Pa), f = frequency (Hz) / focal length (m), i = i, m = mass (kg), n = number (n)
Solved example
Given: f = 7, i = 5, m = 10, n = 4
Find: P (power (W) / pressure (Pa))
- Formula: P = i·m·n/f
- Substitute the values: P = 10·4·5/7
- Result: P = 28.571429 dioptre
Answer: P = 28.571429 dioptre
Calculator
How to calculate Power of lens
- Write down the formula: P = 1/f (in m).
- Note the known values (f, i, m, n).
- Substitute them and simplify to find P.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Power of lens?
The formula is P = 1/f (in m), where P = power (W) / pressure (Pa), f = frequency (Hz) / focal length (m), i = i, m = mass (kg), n = number (n).
What is Power of lens when f = 7, i = 5, m = 10, n = 4?
P = 28.571429 dioptre. Substitute the values into P = 1/f (in m) and simplify.
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