Question:
Identify the mismatch in the following
Identify the mismatch in the following
Show Hint
To remember lens corrections:
- Myopia (Short word/Short sight) = Concave (Diverging)
- Hypermetropia (Long word/Long sight) = Convex (Converging)
And for mirrors: Convex is for the Complex traffic behind you (Wide view)!
Updated On: May 6, 2026
- Myopia - Concave lens
- For rear view - Concave mirror
- Hypermetropia - Convex lens
- Astigmatism - Cylindrical lens
- Reflecting telescope - Convex mirror
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The Correct Option is B
Solution and Explanation
Concept:
Optical instruments and the correction of vision defects rely on the specific reflective or refractive properties of mirrors and lenses.
• Vision Defects: Myopia (nearsightedness) requires diverging (concave) lenses to push the image back to the retina. Hypermetropia (farsightedness) requires converging (convex) lenses to bring the image forward. Astigmatism is corrected using cylindrical lenses to account for irregular corneal curvature.
• Mirrors in Vehicles: A rear-view mirror must provide a wide field of view and always produce an upright image. Convex mirrors are used for this purpose because they diverge light and create a diminished, upright virtual image.
• Telescopes: Reflecting telescopes (like the Cassegrain design) use parabolic primary mirrors and often convex secondary mirrors to focus light.
Step 1: Analyze the optical properties of rear-view mirrors.
Concave mirrors are converging mirrors. Depending on the object's position, they can produce enlarged, inverted, or virtual images. However, their field of view is narrow. If used as a rear-view mirror, the image of a distant car would appear inverted, which is dangerous for driving.
Step 2: Identify the mismatch.
A convex mirror is used for rear-view purposes because it provides a much wider field of view compared to a plane or concave mirror and always produces an erect image. Therefore, the pairing in option (B) "For rear view - Concave mirror" is a mismatch.
• Vision Defects: Myopia (nearsightedness) requires diverging (concave) lenses to push the image back to the retina. Hypermetropia (farsightedness) requires converging (convex) lenses to bring the image forward. Astigmatism is corrected using cylindrical lenses to account for irregular corneal curvature.
• Mirrors in Vehicles: A rear-view mirror must provide a wide field of view and always produce an upright image. Convex mirrors are used for this purpose because they diverge light and create a diminished, upright virtual image.
• Telescopes: Reflecting telescopes (like the Cassegrain design) use parabolic primary mirrors and often convex secondary mirrors to focus light.
Step 1: Analyze the optical properties of rear-view mirrors.
Concave mirrors are converging mirrors. Depending on the object's position, they can produce enlarged, inverted, or virtual images. However, their field of view is narrow. If used as a rear-view mirror, the image of a distant car would appear inverted, which is dangerous for driving.
Step 2: Identify the mismatch.
A convex mirror is used for rear-view purposes because it provides a much wider field of view compared to a plane or concave mirror and always produces an erect image. Therefore, the pairing in option (B) "For rear view - Concave mirror" is a mismatch.
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