The lenses form different types of images when object placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus. When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between focus and optical center of the convex lens, erect and magnified image is formed. As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also, the size of image goes on increasing and the image is always real and inverted. A concave lens always gives a virtual, erect, and diminished image irrespective to the position of the object.

1. The location of image formed by a convex lens when the object is placed at infinity is

(a) At focus (b) At 2F

(c) At optical center (d) Between F and 2F

1. When the object is placed at the focus of concave lens, the image formed is:

(a) Real and smaller (b) Virtual and inverted

(c) Virtual and smaller (d) Real and erect

iii. The size of image formed by a convex lens when the object is placed at the focus of convex lens is:

(a) Small (b) Point in size

(c) Highly magnified (d) Same as that of object

1. When the object is placed at 2F in front of convex lens, the location of image is:

(a) At F (b) At 2 F on the other side

(c) At infinity (d) Between F and optical center

1. At which location of object in front of concave lens, the image between focus and optical centre is formed:

(a) Anywhere between centre and infinity (b) At F

(c) At 2F (d) Infinity