Unit 4 - Lenses

Front

What is the focal point in lens optics?

Back

The focal point is the point where parallel rays of light converge after passing through a lens.

Front

What happens to the image when an object is placed at the focal point of a convex lens?

Back

There is no image produced when an object is placed at the focal point of a convex lens.

Front

How does increasing the distance of an object from a convex lens affect the size of the image?

Back

The image becomes smaller as the distance of the object from the convex lens is increased.

Front

What type of image is produced when an object is placed between the focal point and a convex lens?

Back

A virtual, enlarged, and upright image is produced when an object is placed between the focal point and a convex lens.

Front

Describe the characteristics of an inverted image produced by a convex lens.

Back

An inverted image produced by a convex lens is typically smaller than the object.

Front

What is refraction in the context of lenses?

Back

Refraction is the bending of light rays as they pass through different media, such as from air into a lens.

Front

What is the difference between real and virtual images?

Back

Real images can be projected on a screen and are inverted, while virtual images cannot be projected and are upright.

Front

What happens to the image when an object is moved closer to a convex lens?

Back

The image becomes larger and inverted as the object is moved closer to a convex lens.

Front

What is the significance of the principal axis in lens optics?

Back

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

Front

How does the curvature of a lens affect its focal length?

Back

A lens with a greater curvature has a shorter focal length, while a lens with less curvature has a longer focal length.