For using a convex lens as magnifying lens (magnifying glass), where should the object be placed?

For using a convex lens as magnifying lens (magnifying glass), where should the object be placed? Correct Answer At the principal focus

The correct answer is At the principal focus.

• A convex lens acts as a magnifying glass when it forms a virtual, erect, and magnified image of an object. For this, the object is to be placed between the principal focus and optical center of the lens.

Important Points

• A magnifying glass is a convex lens used to make an object appear much larger than it actually is. This works when the object is placed at a distance less than the focal length from the lens.
• A convex lens is used as a magnifying glass as it converges parallel beams of light into one concentrated beam of light. The convex lens is used in the magnifying glass.
• It helps in magnifying an object that is placed. In order to see an image, the frame is placed right above the object.
• Magnifying glasses are CONVEX. Convex lenses produce images that are upright, enlarged, and virtual once the images are located behind the mirror or lens. 
• Concave lenses are used in telescope and binoculars to magnify objects.
• As a convex lens creates blurs and distortion, telescope and binocular manufacturers install concave lenses before or in the eyepiece so that a person can focus more clearly.
• Convex Lens is used in the projector to get the magnified image.
• Convex Lens is placed in front of an object such that the object is between F and 2F.