Question

write rules for sign convention​

Answer 1

Explanation:

Rules for sign convention :

1. All distances should be measured from the pole.

2. The distances measured in the direction of incident light, to be taken positive and measured in the opposite direction of incident light to be taken negative.

3. Height of object and height of image are positive if measured upward from the axis and negative if measured downward.

4. For a concave mirror, focal length in negative and for a convex mirror, focal length is positive.

Hope it helps!!!

Answer 2

Sign convention is a set of rules to set signs for image distance, object distance, focal length, etc for mathematical analysis of image formation. According to it:

Object is always placed to the left of mirror

All distances are measured from the pole of the mirror.

Distances measured in the direction of the incident ray are positive and the distances measured in the direction opposite to that of the incident rays are negative.

Distances measured along y-axis above the principal axis are positive and that measured along y-axis below the principal axis are negative.

Note: Sign convention can be reversed and will still give the correct results.

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