Mirror and Lens

Front

What is a convex lens?

Back

A convex lens is a lens that is thicker in the middle than at the edges and converges light rays that are coming in parallel to its principal axis.

Front

What type of image does a convex lens produce?

Back

A convex lens can produce both real and virtual images depending on the position of the object.

Front

What is a concave lens?

Back

A concave lens is a lens that is thinner in the middle than at the edges and diverges light rays that are coming in parallel to its principal axis.

Front

What type of image does a concave lens produce?

Back

A concave lens always produces virtual images that are upright and smaller than the object.

Front

What is a real image?

Back

A real image is formed when light rays converge and can be projected onto a screen; it is inverted.

Front

What is a virtual image?

Back

A virtual image is formed when light rays appear to diverge from a point; it cannot be projected onto a screen and is upright.

Front

What is the difference between concave and convex mirrors?

Back

Concave mirrors converge light rays and can produce real images, while convex mirrors diverge light rays and always produce virtual images.

Front

What is the purpose of a convex mirror in a shop?

Back

A convex mirror allows a shopkeeper to see a wider view of the store and its customers, helping to prevent shoplifting.

Front

What is the focal point of a lens?

Back

The focal point of a lens is the point where parallel rays of light either converge (convex lens) or appear to diverge (concave lens) after passing through the lens.

Front

What is the principal axis of a lens?

Back

The principal axis is an imaginary line that passes through the center of the lens and is perpendicular to its surfaces.