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In a concave lens, the focal length is: (2023)

Practice Questions

Q1
In a concave lens, the focal length is: (2023)
  1. Positive
  2. Negative
  3. Zero
  4. Infinite

Questions & Step-by-Step Solutions

In a concave lens, the focal length is: (2023)
  • Step 1: Understand what a concave lens is. A concave lens is thinner in the middle and thicker at the edges.
  • Step 2: Know that lenses can bend light. A concave lens bends light rays outward, making them diverge.
  • Step 3: Learn about focal length. Focal length is the distance from the lens to the point where light rays meet or appear to meet.
  • Step 4: For concave lenses, the focal point is virtual, meaning light rays do not actually meet but appear to come from a point behind the lens.
  • Step 5: Because the focal point is virtual, the focal length of a concave lens is considered negative.
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