The lens used in a simple microscope is :

The correct answer is Convex.

Key Points

• A simple microscope typically uses a convex lens to magnify small objects.
• Convex lenses converge light rays and create an enlarged image of an object placed close to the lens.
• The magnification power of a simple microscope depends on the focal length of the convex lens.
• Convex lenses are commonly used in magnifying glasses and simple microscopes due to their ability to produce a virtual, magnified image when used at a suitable distance from the object.

Additional Information

• Convex Lens: A lens that is thicker in the center than at the edges and converges light rays to a focal point.
• Simple microscopes use a single convex lens to magnify objects, typically for viewing small details like cells or fine prints.
• Concave lenses, on the other hand, diverge light rays and are used in devices like eyeglasses to correct nearsightedness.
• Magnification in a simple microscope can be calculated using the formula: Magnification = 1 + (D / f), where D is the distance of distinct vision (usually 25 cm), and f is the focal length of the convex lens.
• Cylindrical lenses are used in optical devices like corrective lenses for astigmatism, not for magnification.
• The use of a convex lens allows us to observe objects in greater detail, making them crucial in fields like biology and inspection.