Find the Power of a Bi Convex Lens

AI Thread Summary
The focal length of a bi-convex lens is given as 25 cm, leading to the calculation of its power using the formula D = 1/f. The correct unit for focal length should be in meters, so converting 25 cm to meters gives 0.25 m. This results in a power of +4 diopters, indicating that the lens converges light. The discussion clarifies the importance of using the correct units in lens power calculations.
Deebu R
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Homework Statement


If the focal length of the bi convex lens is 25 cm then the power of the lens will be?
Since the light striking the lens converges at a point behind the lens will the answer come in positive?

Homework Equations


Power of lens D= 1/f

The Attempt at a Solution


D= 1/25= +0.04 dioptre[/B]
 
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You are using the wrong units in your formula.
 
rude man said:
You are using the wrong units in your formula.
Focal length should be in mm?
 
Or is it meters? Is the answer +4 diopter?
 
Correct
 
I see.Thank you for the help rude man and BvU.
 
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