Question

What type of lens is a magnifying glass? a) converging c) spherical e) plain b) diverging d) cylindrical

Short answer

Answer: A magnifying glass is a converging lens.

Step-by-step solution

Understanding the function of a magnifying glass

A magnifying glass is an optical instrument used to magnify small objects, making them appear larger to the human eye. The magnification is achieved by focusing the light rays coming from the object through a lens, which then forms an enlarged image of the object.

Identifying the lens type by their function

There are several types of lenses, each with different functions. Let's briefly explain their functions: a) Converging lens: Also known as a convex lens, it brings parallel light rays together to a single point called the focal point. b) Diverging lens: Also known as a concave lens, it spreads parallel light rays apart, causing them to diverge away from a single point. c) Spherical lens: This lens type has a curved surface in the shape of a sphere. It may either be converging or diverging, depending on whether the surface is convex or concave. d) Cylindrical lens: This type has at least one surface that is cylindrically shaped. It is often used to correct astigmatism, a type of vision impairment. e) Plain lens: This option is not correct, as it most likely refers to a "plane" lens, which is a flat lens with no curvature, and thus does not provide any magnification.

Selecting the correct lens type for a magnifying glass

Now that we understand the function of a magnifying glass and the various types of lenses, we can determine which type of lens a magnifying glass is. Since a magnifying glass focuses light rays and forms an enlarged image of an object, it must be a converging lens, which is the only type of lens with this function. Answer: A magnifying glass is a converging lens (option a).