Understanding Lenses and Their Properties

The video tutorial covers spherical lenses, focusing on converging and diverging types. It explains how to draw ray diagrams and describes the image formation process for different object positions. The tutorial also includes an interactive activity to reinforce learning about lens behavior.

What is a characteristic feature of converging lenses?

• They are thicker in the middle.

• They have a flat surface.

• They are thicker at the edges.

• They are thinner in the middle.

Which type of lens has one flat surface and one spherical surface?

• Biconvex lens

• Biconcave lens

• Concavo-convex lens

• Plano-convex lens

What happens to a ray of light that passes through the optical center of a converging lens?

• It reflects back.

• It diverges away from the lens.

• It continues in the same direction.

• It bends towards the focal point.

When an object is placed beyond the focal point of a converging lens, what type of image is formed?

• Virtual, upright, and larger

• Real, inverted, and smaller

• Virtual, inverted, and smaller

• Real, upright, and larger

What is the nature of the image formed when an object is placed at the focal point of a converging lens?

• Virtual and upright

• Real and upright

• Real and inverted

• No image is formed

How does a diverging lens affect parallel rays of light?

• It makes them parallel.

• It reflects them back.

• It converges them to a point.

• It diverges them as if they are coming from a focal point.

What is the representation of a diverging lens?

• A line with arrows pointing outward

• A line with arrows pointing inward

• A line with one arrow pointing outward and one inward

• A line with no arrows

What type of image is formed by a diverging lens?

• Real, upright, and smaller

• Virtual, upright, and smaller

• Real, inverted, and larger

• Virtual, inverted, and larger

What should students do with the online tool in the activity?

• Draw diagrams of lenses on paper.

• Create a video explaining lens properties.

• Write a report on the behavior of lenses.

• Move the object and focus to different positions and take screenshots.

How many positions should students explore with the converging lens in the activity?

• Three

• Four

• Five

• Six