how can you identify a which rule to use while drawing a ray diagram
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It depends on the kind of mirror or lens on which the question is asked. You should remember the sign convention for each mirror and lens.
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1 always use a ruler while drawing a ray diagram.never draw free hand ray diagram.
2 The distance between pole and focus and between focus and center of curvature should be same on both sides of lens and mirror.
3 always draw arrow head on the ray to show their path.
I hope it will help you please follow me
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