A lens forms a virtual image at a distance of 20 cm when the object is placed at
Practice Questions
Q1
A lens forms a virtual image at a distance of 20 cm when the object is placed at 10 cm. What is the type of lens?
Convex lens
Concave lens
Bifocal lens
Plano-convex lens
Questions & Step-by-Step Solutions
A lens forms a virtual image at a distance of 20 cm when the object is placed at 10 cm. What is the type of lens?
Step 1: Understand that a virtual image is formed when light rays appear to diverge from a point, but do not actually converge.
Step 2: Know that a concave lens is the type of lens that can create a virtual image.
Step 3: Remember that a concave lens causes parallel rays of light to diverge, making it seem like they come from a point behind the lens.
Step 4: Since the problem states that a virtual image is formed at a distance of 20 cm when the object is placed at 10 cm, this confirms that the lens must be concave.
Lens Types – Understanding the difference between concave and convex lenses, particularly how they form real and virtual images.
Image Formation – Knowledge of how the position of the object relative to the lens affects the type of image formed (real or virtual).
