Converging Lenses _ GCSE Physics

The video tutorial explains how lenses use refraction to form images, focusing on converging and diverging lenses. It details the process of drawing ray diagrams to illustrate light refraction through lenses, leading to real image formation at the principal focus. The tutorial also covers how to determine image characteristics such as magnification, orientation, and reality. It explains the concept of virtual images using a magnifying glass as an example, and how to calculate magnification by comparing image and object heights.

What is the main function of a lens in terms of light?

• To change the direction of light

• To absorb light

• To block light

• To reflect light

Which type of lens is represented by a symbol and can form a real image?

• Concave lens

• Diverging lens

• Converging lens

• Bifocal lens

What is the first step in drawing a ray diagram for a lens?

• Draw the image

• Draw the focal point

• Place the object above the lens

• Draw the principal axis

How can you determine if an image is magnified or diminished using a ray diagram?

• By comparing the image height to the object height

• By measuring the distance from the lens

• By counting the number of rays

• By checking the color of the image

If an object is 25 cm high and its image is 75 cm high, what is the magnification factor?

• 4 times

• 1.5 times

• 3 times

• 2 times