Question

Drawing a ray diagram for an object far (at finite distance) from convex lens requires how many rays?1) one2) two3) three4) four

Answer 1

The object present far from the convex lens considered as present above and below the principal axis.

The rays of light required to form an image come from both above part of teh object and below part of the object present below the principal axis.

If the object is at infinity then 4 rays are required to form an image.

If the object is behind the center of curvature then 2 rays are required to form the image.

For the finite distance of the object from the convex lens.

Thus, the number of rays are two.

Hence, option 2 is the correct answer.