Question

A magnifying glass is what kind of lens, and where should I place the lens relative to the object to see an image larger than the object and right-side up? (f stands for the focal length of the lens.)
A. Type of lens – convex, Location of Lens Relative to Object in terms of f – closer than f to object.
B. Type of lens – concave, Location of Lens Relative to Object in terms of f – closer than f to object.
C. Type of lens – convex, Location of Lens Relative to Object in terms of f – between f and 2f from object.
D. Type of lens – concave, Location of Lens Relative to Object in terms of f – between f and 2f from object.
E. Type of lens – convex, Location of Lens Relative to Object in terms of f – greater than 2f from object.

Answer 1

Hint: When an object is less than one focal length from the convex lens, the image formed is virtual, enlarged and upright. When using a magnifying glass, we adjust the lens so that it is less than one focal length from the object.

Complete step by step answer:
A magnifying glass is a convex lens. The type of image that a convex lens forms depends on where the object is relative to the focal point of the lens. If the object is more than two focal lengths from the lens, the image is real, reduced, inverted and on the opposite side of the lens from the object. As the object moves closer to the lens, the image gets larger. When the object is between one and two focal lengths from the lens, the image is larger but is still inverted. When the object is less than one focal length from the lens, only then we get an image that is enlarged and upright. The images in a concave lens are always smaller than the object. Hence, a concave mirror can never form a magnifying glass.

So, the correct answer is “Option A”.

Note:
The image formed in a magnifying glass is virtual. This is because the light rays from the object do not converge after they have passed through the lens.