How to Draw Ray Diagrams

• What type of lenses cause light rays to diverge?

  Concave lenses
• What symbol represents a concave lens in ray diagrams?

  A v shape pointing outwards
• What is the horizontal line through the middle of the lens called?

  The axis
• What are the focal points in relation to a lens?

  Points where light rays converge or diverge
• What is another term for the focal point?

  Principal focus
• What does the label '2f' represent in ray diagrams?

  Twice the distance of the focal point
• How do you represent a concave lens in a ray diagram?

  With outward pointing v shapes
• What happens to the ray that passes through the center of a concave lens?

  It continues straight without refraction
• What is the first step in drawing a ray diagram for a concave lens?

  Draw incident rays from the object
• How do you find the point where the light rays cross in a ray diagram?

  Locate the intersection of the rays
• What characteristics describe the image formed by a concave lens?

  Virtual, upright, and smaller
• What type of lenses focus light onto a single point?

  Convex lenses
• How do the v shapes at the ends of a convex lens differ from those of a concave lens?

  They point inwards for convex lenses
• What happens to the ray that passes through the center of a convex lens?

  It continues straight without refraction
• How do you determine the location of the image in a ray diagram for a convex lens?

  Find the intersection of the refracted rays
• What characteristics describe the image formed by a convex lens when the object is more than two focal lengths away?

  Real, inverted, and smaller
• What happens to the image if the object is exactly at two focal lengths from a convex lens?

  The image is real and the same size
• What occurs when the object is between the focal point and the lens in a convex lens setup?

  The image is virtual, upright, and larger
• What are the steps to draw a ray diagram for a concave lens?

  1. Draw the concave lens symbol.
  2. Add the axis and focal points.
  3. Draw incident rays from the object.
  4. Identify the point where rays cross.
  5. Comment on the image characteristics.
• What are the steps to draw a ray diagram for a convex lens?

  1. Draw the convex lens symbol.
  2. Add the axis and focal points.
  3. Draw incident rays from the object.
  4. Identify the point where rays cross.
  5. Comment on the image characteristics.
• What are the characteristics of images formed by concave and convex lenses?

  Concave lens:

  • Virtual
  • Upright
  • Smaller

  
  

  Convex lens:

  • Real (if beyond 2f)
  • Inverted
  • Smaller (if beyond 2f)
• What is the significance of the focal point in lens diagrams?

  • Determines ray behavior
  • Affects image characteristics
  • Essential for accurate diagrams
• How do you ensure accuracy in ray diagrams for simple objects like arrows?

  • Always draw rays from the top of the arrow
  • Follow the established ray diagram rules