Correct option is C
Explanation:
The glasses used in spectacles and watchmakers' magnifying glasses are examples of
lenses. Lenses are transparent optical components that refract light rays to converge or diverge them, forming an image.
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Spectacles use lenses to correct vision by adjusting the focus of light entering the eyes. Depending on the requirement, these can be concave lenses (for nearsightedness) or convex lenses (for farsightedness).
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Watchmakers' magnifying glasses use convex lenses to enlarge the appearance of small objects, making them easier to see and work with.
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Plane mirrors reflect light but do not refract it, so they don't have the focusing properties of lenses.
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Concave mirrors and
convex mirrors are types of mirrors that reflect light but are not used in spectacles or magnifying glasses.
Lenses are specifically designed to bend light to either focus or disperse it, which is essential for vision correction and magnification.
