Question

The image of an object positioned at twice the focal length from a converging or convex lens will be

	a.	the same size as the object.
	b.	smaller than the object.
	c.	larger than the object.

Answer 1

option a is the right answer. When the object is located at the 2F point, the image will also be located at the 2F point on the other side of the lens. In this case, the image will be inverted (i.e., a right side up object results in an upside-down image). The image dimensions are equal to the object dimensions. A six-foot tall person would have an image that is six feet tall; the absolute value of the magnification is exactly 1. Finally, the image is a real image. Light rays actually converge at the image location. As such, the image of the object could be projected upon a sheet of paper.