I am not able to find the sign of object distance of a convex lens. Is it + or - ?
Asked by krishna
24th February 2017,
5:48 PM
Answered by Expert
Answer:
Hi Krishna,
The following illustration can help you understand that the object distance in lens:
- The distances on the principal axis should be measured from the optical center.
- The distances measured in the direction of incident rays are positive and the distances measured in the direction opposite to that of the incident rays are negative.
- All distances measured above the principal axis are positive.
- Therefore, height of an object and that of an erect image are positive and the distances measured below the principal axis are negative.
Answered by Expert
24th February 2017,
6:39 PM
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