Question

Explain how to draw a ray diagram for a convex lens. Be sure to mention the 3 main rays.

Answer 1

To draw a ray diagram for a convex lens, follow these steps:

1. Draw the principal axis: The principal axis is a horizontal line passing through the center of the lens.
2. Draw the lens: Draw a convex lens centered on the principal axis.
3. Draw the object: Draw an arrow on the left side of the lens to represent the object. The arrow should be perpendicular to the principal axis.
4. Ray 1: Draw a ray from the top of the object parallel to the principal axis. This ray will pass through the focal point on the right side of the lens after refraction.
5. Ray 2: Draw a ray from the top of the object passing through the center of the lens. This ray will not change direction.
6. Ray 3: Draw a ray from the top of the object passing through the focal point on the left side of the lens. This ray will become parallel to the principal axis after refraction.
7. Locate the image: The point where the three rays intersect on the right side of the lens is the location of the image. Draw an arrow to represent the image.

Remember, the three main rays are:

1. A ray parallel to the principal axis that passes through the focal point on the opposite side of the lens.
2. A ray that passes through the center of the lens and is not refracted.
3. A ray that passes through the focal point on the same side of the lens and becomes parallel to the principal axis after refraction.