Question

What are the new Cartesian sign conventions ? explain diagrammatically ​

Answer 1

Answer:

According to the new Cartesian sign convention for the refraction of light through the concave and convex lens: All distances are measured from the optical centre of the lens. Distances measured in the direction opposite to the direction of incident light are considered negative.

Answer 2

Answer:   According to the sign convention, a convex lens focal length is positive, whereas a concave lens focal length is negative. The incident light always moves from left to right because the object is always on the lens’s left side. All distances measured from the optical centre of the lens to the right side will be considered positive. According to the new Cartesian sign convention for the refraction of light through the concave and convex lens:

All distances are measured from the optical centre of the lens.

Distances measured in the direction opposite to the direction of incident light are considered negative.

Distances measured in the same direction as the incident light are considered positive.

Heights measured upwards and perpendicular to the principal axis are considered positive.

Heights measured downwards and perpendicular to the principal axis are considered negative.

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