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

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

Options:

Correct Answer: Negative

Exam Year: 2023

Solution:

The focal length of a concave lens is negative, indicating that it diverges light rays.

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

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.

Focal Length of Lenses – The focal length of a lens determines how it converges or diverges light; concave lenses have a negative focal length.
Lens Types – Understanding the difference between concave and convex lenses and their effects on light.