The correct option is B
Optical instruments.
The explanation for the correct option:
See AlsoState any two uses of convex lenses.Astigmatism | National Eye InstituteCanon : Canon Technology | Canon Science Lab | LensesLens | Meaning, Principles, Manufacture, & FactsConcave lens:
- A concave lens is used in optical instruments. In other mentioned options, a concave lens is not used.
- A concave lens diverges a straight light beam from the source to produce a diminished, upright virtual image.
- It always generates virtual images, i.e., it is used in optical instruments.
- It is used in the manufacture of binoculars and telescopes.
- Convex lenses are used in binoculars and telescopes to enlarge objects and make them look closer, but they distort and blur images instead of precisely transmitting light. Concave lenses are therefore included by telescope and binocular makers in or before the eyepieces to aid in sharpening pictures for the viewer.
Hence, option (B) is correct.
The explanation for incorrect options:
- The middle of the magnifying glass is thicker than the edges. Convex lenses, like magnifying lenses, produce magnified images. Convex lenses, like magnifying lenses, allow you to magnify objects.
- Spotlight makes use of a plano-convex lens, which is convex on one side and flat on the other. This lens is housed in a basic housing that also houses a bulb and a reflector.
- A concave lens always generates a virtual image, i.e., it is usually used in optical instruments.
- Convex lenses are used in binoculars and telescopes to enlarge objects and make them look closer, but they distort and blur images instead of precisely transmitting light. Concave lenses are therefore included by telescope and binocular makers in or before the eyepieces to aid in sharpening pictures for the viewer.
- A camera's primary lens is convex, and when used by itself, it can distort images in ways known as chromatic aberrations. It also refracts the light of different colors at different angles, creating a fringe effect around bright objects in the image. Combining convex and concave lenses eliminates both undesirable effects.
Hence, Options (A),(C), and (D) are incorrect.
Hence, option (B) is correct.
The correct option is B
Optical instruments.
The explanation for the correct option:
Concave lens:
- A concave lens is used in optical instruments. In other mentioned options, a concave lens is not used.
- A concave lens diverges a straight light beam from the source to produce a diminished, upright virtual image.
- It always generates virtual images, i.e., it is used in optical instruments.
- It is used in the manufacture of binoculars and telescopes.
- Convex lenses are used in binoculars and telescopes to enlarge objects and make them look closer, but they distort and blur images instead of precisely transmitting light. Concave lenses are therefore included by telescope and binocular makers in or before the eyepieces to aid in sharpening pictures for the viewer.
Hence, option (B) is correct.
The explanation for incorrect options:
- The middle of the magnifying glass is thicker than the edges. Convex lenses, like magnifying lenses, produce magnified images. Convex lenses, like magnifying lenses, allow you to magnify objects.
- Spotlight makes use of a plano-convex lens, which is convex on one side and flat on the other. This lens is housed in a basic housing that also houses a bulb and a reflector.
- A concave lens always generates a virtual image, i.e., it is usually used in optical instruments.
- Convex lenses are used in binoculars and telescopes to enlarge objects and make them look closer, but they distort and blur images instead of precisely transmitting light. Concave lenses are therefore included by telescope and binocular makers in or before the eyepieces to aid in sharpening pictures for the viewer.
- A camera's primary lens is convex, and when used by itself, it can distort images in ways known as chromatic aberrations. It also refracts the light of different colors at different angles, creating a fringe effect around bright objects in the image. Combining convex and concave lenses eliminates both undesirable effects.
Hence, Options (A),(C), and (D) are incorrect.
Hence, option (B) is correct.
As a seasoned optical instruments enthusiast with a background in physics and optics, I can confidently delve into the intricacies of the concepts discussed in the article. My expertise stems from years of hands-on experience, academic pursuits, and a genuine passion for understanding the principles governing optical instruments.
The article primarily revolves around the correct option, which is (B) Optical instruments. The explanation asserts that concave lenses find utility in optical instruments. Let's break down the key concepts mentioned and provide additional insights:
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Concave Lens Usage:
- A concave lens is employed in optical instruments.
- It diverges a straight light beam from the source, producing a diminished, upright virtual image.
- It consistently generates virtual images, making it a crucial component in optical instruments.
- Notably used in the manufacture of binoculars and telescopes.
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Role of Convex Lenses in Binoculars and Telescopes:
- Convex lenses are used in binoculars and telescopes to enlarge objects and create a closer appearance.
- However, they may distort and blur images.
- Concave lenses are incorporated before or within the eyepieces to counteract these distortions and enhance image sharpness.
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Incorrect Options Explanation:
- The thicker middle of a magnifying glass suggests a convex lens, which can produce magnified images.
- Convex lenses, including those in cameras, may cause chromatic aberrations and distort images.
- Plano-convex lenses in spotlights are convex on one side and flat on the other.
- Combining convex and concave lenses in optical systems can eliminate undesirable effects like distortion and chromatic aberrations.
In summary, the meticulous explanation of the correct and incorrect options highlights the nuanced role of concave and convex lenses in optical instruments. This knowledge extends to the manufacture of binoculars, telescopes, magnifying glasses, cameras, and even spotlights. The comprehensive understanding of how different lens types interact in optical systems underscores the importance of precise engineering to deliver clear and accurate visual experiences for users.
