The radius of curvature (twice the focal length) of a convex lens is 4

1.	The radius of curvature (twice the focal length) of a convex lens is 40 cm. A student wants to get various images of following types (a) enlarged virtual image, (b) enlarged real image, (c) image of same size, (d) diminished image. In order to get these images where should the object should be kept in front of convex lens?
Answer» a) The object should be kept in less than 20 cm (i.e. less than focal length). b) In order to get enlarged real image, object should be kept between 20 cm to 40 cm in front of lens. c) In order to get image of same size object should be kept at a distance of 40 cm from the lens. d) In order to get diminished image the object should be kept beyond 40 cm from the lens.

The radius of curvature (twice the focal length) of a convex lens is 40 cm. A student wants to get various images of following types (a) enlarged virtual image, (b) enlarged real image, (c) image of same size, (d) diminished image. In order to get these images where should the object should be kept in front of convex lens?

Answer»

a) The object should be kept in less than 20 cm (i.e. less than focal length).

b) In order to get enlarged real image, object should be kept between 20 cm to 40 cm in front of lens.

c) In order to get image of same size object should be kept at a distance of 40 cm from the lens.

d) In order to get diminished image the object should be kept beyond 40 cm from the lens.