Question

Does the object distance is positive or negative in convex lens​

Answer 1

Answer:

-ve because we suppose lens central point as origin point and object placed in the - ve side of x-axis but object height is +ve as it lies in positive direction of y axis

Answer 2

Answer:

here is your answer

Distances measured from the optic center to the right of the lens are considered +ve and t from optic center to the left are -ve. if you draw a line from the optic center and move towards right i.e., along the +ve x-axis then the sign is +ve. Similarly if you move towards the -ve x-axis, the distances are -ve. For converging lens, the light rays meet at a point after refraction, thus it has positive focal length. For diverging lens the light rays appear to meet at a point after refraction, thus virtual focal length and -ve sign.

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