convex and concave lenses

• What is convex lens?

  convex lenses are thicker at the middle than the edges. Rays of light that pass through the covex lens converge. So, a convex lens is also called a converging lens. A magnifying glass is aconvex lens which produces a magnified (larger) image of an object.
• What are the uses of a convex lens?

  Convex lenses are used in microscopes and magnifying glasses, in glasses to correct farsightedness or hypermetropia.
• Whats the function of a convex lens?

  A convex lens causes parallel rays to come to a focus.
• Whats the form of a convex lens?

  The centre of the lens is thicker than the edges.
• How do objects appear in a convex lens?

  It appears closer and larger.
• What is focus?

  Focus is a point at which rays of light meet after being refracted or reflected.
• Whats a focal length?

  The distance between the centre of a lens or curved mirror and iys focus.
• What are some uses of lenses?

  Lenses are used to make binoculars, telescopes, peepholes, glasses etc.
• What is a concave lens?

  Concave lenses are thinner at the middle than the edges. Rays of light that pass through the concave lens diverge or spread out. So, a concave lens is also called a diverging lens. The image formed is virtual and diminished (smaller).
• What are the uses of a concave lens?

  It is used in binoculars and telescopes, in glasses to correct nearsightedness also called myopia, in flashlights to magnify the light produced, in peepholes, and lasers.
• Whats the function of a concave lens?

  A concave lens causes all rays to diverge.
• How do objects appear in a concave lens?

  They appear smaller and farther
• Whats the form of a concave lens?

  centre of the lens is thinner than the edges.