All Flashcards
What are the steps to find an image using a ray diagram?
- Draw a ray parallel to the principal axis, refracting through the far-side focal point. 2. Draw a ray through the center of the lens, continuing straight. 3. Draw a ray through the near-side focal point, refracting parallel to the principal axis. 4. Locate the image at the intersection of the rays.
How do you determine image characteristics using a ray diagram?
- Observe if the image is flipped (inverted) or has the same orientation (upright). 2. Compare the image size to the object size (enlarged, reduced, or same size). 3. Determine if the image is real (on the opposite side) or virtual (on the same side).
What is a convex lens?
A lens that converges parallel light rays to a focal point on the opposite side.
What is a concave lens?
A lens that diverges parallel light rays, making them appear to originate from a focal point on the same side.
What is a real image?
An image formed when light rays converge at a point, capable of being projected onto a screen.
What is a virtual image?
An image formed when light rays diverge, appearing to originate from a point, but cannot be projected.
Define focal length (f).
The distance from the lens to the focal point.
What is object distance ()?
The distance from the object to the lens.
What is image distance ()?
The distance from the lens to the image.
What is the effect of a convex lens on parallel light rays?
The rays converge at the focal point.
What is the effect of a concave lens on parallel light rays?
The rays diverge, appearing to originate from a focal point on the same side of the lens.
What happens when |M| > 1?
The image is larger than the object (enlarged).
What happens when |M| < 1?
The image is smaller than the object (reduced).
What does a negative magnification (M) indicate?
The image is inverted.
What does a positive magnification (M) indicate?
The image is upright.