The ray diagram below shows a case of the image formation by a convex lens. Here the object distance is ____, and the image distance is _____.

The correct answer is: Negative, positive

• According to the spherical lens, the sign convention is as follows:
• Distances that are calculated in the orientation of the incident ray are positive and the distances calculated  in the direction opposite to the incident rays are negative
• Here we have an object kept on one side of a converging lens, the image object will be beyond the lens from the actual object and will be inverted. In the same way with the focal point, if the image is on the opposite side of the lens from the object, the distance from the lens to the image will be positive.
• The ray diagram below shows a case of the image formation by a convex lens. Here the object distance is __Negative__, and the image distance is _Positive____.