Write the rules of sign convention?
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1)all distances should me measured from pole
2)the direction along the incident ray is treated as positive and opp is taken as negative
3)height measured above principal axis is taken as positive and down the axis is taken as negative
2)the direction along the incident ray is treated as positive and opp is taken as negative
3)height measured above principal axis is taken as positive and down the axis is taken as negative
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