Convex Lenses (T)

• What is a convex lens?

  A convex lens is thicker at the center than at the edges.
• What happens to light waves when they move from air to glass?

  They slow down and bend towards the normal.
• What occurs when light waves move from glass back to air?

  They speed up and move away from the normal.
• What is the key feature of all lenses?

  • Lenses refract light
  • Light bends towards the normal when entering the lens
  • Light bends away from the normal when exiting the lens
• What is the symbol for a convex lens?

  The symbol for a convex lens is represented by a specific diagram that students should learn.
• What is the principal axis in relation to a convex lens?

  It is the line along which the central ray passes through the lens without changing direction.
• What is the principal focus of a convex lens?

  The principal focus is the point where refracted rays converge, denoted by the symbol capital F.
• How does the focal length of a convex lens vary?

  Different convex lenses have different focal lengths based on their strength.
• What are the three key features of an image formed by a convex lens when the object is more than two focal lengths away?

  • The image is diminished (smaller than the object)
  • The image is inverted (upside down)
  • The image is real (rays meet at a point)
• What are the three key features of an image formed by a convex lens when the object is between one and two focal lengths away?

  • The image is magnified (larger than the object)
  • The image is inverted (upside down)
  • The image is real (rays meet at a point)
• How does the distance between the object and the lens affect the properties of the image formed?

  The distance affects whether the image is diminished or magnified, but it remains inverted and real in both cases.