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
Which one of the following colours may be obtained by combining green and red colours?
Which of the following are the primary colours of light?
Directions: The following items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below:
Statement I: Diamond is very bright.
Statement II: Diamond has very low refractive index
A non-SI unit called 'nit' is the unit of which of the following photometric quantities used to measure a multitude of light intensity?
Which among the following is used as a reflector in search lights?
