Find the Power of a Bi Convex Lens

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Homework Help Overview

The discussion revolves around calculating the power of a bi-convex lens given its focal length of 25 cm. Participants explore the implications of the lens's converging nature on the sign of the power.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the formula for lens power and question the units used for focal length, considering whether it should be in centimeters, millimeters, or meters.

Discussion Status

There is an ongoing examination of the correct units for focal length, with some participants suggesting different interpretations. Acknowledgment of correct calculations has been noted, but no consensus on the final answer has been reached.

Contextual Notes

Participants are addressing potential unit conversion issues, which may affect the calculation of the lens power.

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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