Light and Lenses Quiz

Which lens is used to correct myopia (short-sightedness)?

The focal length of a convex lens is:

When a ray of light passes through the optical center of a thin lens, it:

Which of the following lenses always forms a virtual, erect image?

The unit of power of a lens is:

If the focal length of a lens is 50 cm, its power is:

The image formed by a convex lens when the object is placed beyond 2F is:

Which lens is commonly used in a magnifying glass?

The ability of a lens to bend light is called:

In a camera, which lens is used to focus light?

What happens to the focal length of a lens when it is immersed in water?

A lens has a power of –2 D. The lens is:

Which defect of vision occurs when the eye lens has too much converging power?

The magnification produced by a concave lens is always:

The focal length of a lens is the distance between:

Which of the following quantities can be negative for a lens?

An object is placed at the focus of a convex lens. The image formed is:

Which optical instrument uses a combination of two convex lenses?

The phenomenon responsible for the working of lenses is:

A convex lens has equal radii of curvature. The lens is: