Lens Shape Identification
The question describes a lens that has a specific shape: thin in the middle and thick at its periphery (edges).
Defining Lens Characteristics
We need to identify which type of lens matches this description.
- Concave Lens: By definition, a concave lens is thinner at the center and thicker at the edges. It causes parallel light rays to diverge.
- Convex Lens: Conversely, a convex lens is thicker at the center and thinner at the edges. It converges parallel light rays.
- Cylindrical Lens: These lenses have curvature along one axis only.
- Parallel Lens: This is not a standard classification based on shape in this context.
Matching Description to Lens Type
The description "thin in the middle and thick at its periphery" directly matches the physical characteristics of a concave lens.
Conclusion
Therefore, the lens described is a concave lens.
Similar Questions
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Important Questions from Optics
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
The power of a lens is -2.5 D. The type of lens and its focal length are respectively:
