which lens is used of its d value is negative
Answers
Explanation:
Similarly, a converging lens always has a positive f, and a diverging lens has a negative f. The signs associated with magnification also work the same way for lenses and mirrors. A positive magnification corresponds to an upright image, while a negative magnification corresponds to an inverted image
Explanation:
Taking u as a negative number in the lens formula is just a convention.
If you take u as a positive number and lengths on the other side of the lens as a negative number you would get the same results as long as you are consistent with the signs.
However, the problem is that if all the others are using a sign convention different from yours there might be some confusion when others read what you have written.
Further, if you are a student and if you use a convention different from what is generally used, it is possible that the examiner may not give you full marks thinking that you don’t know the commonly used sign convention.