A non-spherical shining spoon can generally be considered as a

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Spherical mirror

Parabolic mirror

Plane mirror

Lens

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UPSC CDS-1 – 2021

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A shining spoon has a curved surface that acts as a mirror. While the inner part acts like a concave mirror and the outer part like a convex mirror, the curve of a spoon is generally not a perfect sphere. A common non-spherical curved mirror shape is a parabolic mirror, which has the property of focusing parallel light rays to a single point. Given that the spoon is described as ‘non-spherical’, a parabolic mirror is a suitable description for a curved mirror that is not spherical. It is definitely not a plane mirror or a lens.

A spoon’s curved, reflective surface acts as a mirror. Non-spherical curved mirrors, like parabolic mirrors, have specific shapes and optical properties.

Spherical mirrors are simpler approximations often used in basic optics. Parabolic mirrors are used in applications requiring precise focusing, such as telescopes and satellite dishes.

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