Which optical instrument is used to correct the eye defect known as Hypermetropia (or long-sightedness), where light focuses behind the retina?
Convex Lens
In Hypermetropia, the eye lens focuses incoming light behind the retina instead of directly on it, causing difficulty in seeing nearby objects clearly.
A convex lens converges light rays before they enter the eye, effectively shifting the focal point forward onto the retina, thereby correcting the defect.
A concave lens is used for Myopia (short-sightedness), a cylindrical lens is used for Astigmatism, and photochromic lenses only darken with light exposure and do not correct focusing defects.
Hence, the correct answer is Convex Lens.
Similar Questions
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- The lens which is thin in the middle and thick at its periphery is called a:
- Which colour deviates the least when light passes through a prism?
- Shadows are formed when _____ objects come in the path of light.
- Which type of mirror is used by dentists to see large images of patients' teeth?
- The blue colour of the sky is due to the:
- If a lens has a focal length of $25\text{ cm}$, what will be the power of that lens?
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- For a person with Hypermetropia or far-sightedness, the near point, is _____ farther away from the normal near point.
Important Questions from Optics
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
The power of a lens is -2.5 D. The type of lens and its focal length are respectively:
