Question

hlW MAteS,


I have a simple question..

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how can I remember sign convention for concave and convex lens ??

Answer 1

u basically have to think of a graph....

=> to the right is positive.

=> to the left is negetive.

=> perpendicular to and above the principal axis is positive.

=> perpendicular to and below the principal axis is negetive.

Answer 2

The sign convention is based on the direction of light. For easy understanding it revolves around the XY coordinate system as long as direction of light is from left to right.[1] All measurements are taken starting from the origin.



Distance measured -

1. Above x-axis is positive ; below x-axis is negative.

[virtual image is erect = above axis = positive; real image is inverted = below axis = negative]

2. For y-axis, right of origin is positive ; left of origin is negative.

[By convention, object distance is always negative


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