What are Assumptions for lens
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According to new Cartesian sign convention, object is always placed on the left side of the lens
1. All the distance are measured from optical centre (c) of lens to the right side will be considered positive because they will be in the same direction of incident ray
2. On the other hand, distance measured from optical centre to the left side are considered as negative.
3. Focal length of convex lens is positive and concave lens is negative.
4. The distances measured upward and perpendicular to the principal axis are taken as positive.
5. The distance measured downward and perpendicular to the principal axis is considered negative.
1. All the distance are measured from optical centre (c) of lens to the right side will be considered positive because they will be in the same direction of incident ray
2. On the other hand, distance measured from optical centre to the left side are considered as negative.
3. Focal length of convex lens is positive and concave lens is negative.
4. The distances measured upward and perpendicular to the principal axis are taken as positive.
5. The distance measured downward and perpendicular to the principal axis is considered negative.
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