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:
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:
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