A person needs spectacles with a power of -2.5 D. This indicates that the person is suffering from:
Myopia (nearsightedness) and needs a diverging lens.
A negative lens power indicates a diverging (concave) lens, which is used to correct Myopia or nearsightedness. In myopia, the eyeball is elongated or the eye lens is too curved, causing light rays to focus in front of the retina instead of on it, so a diverging lens spreads the rays out to correct the focus.
Similar Questions
Which one of the following processes is responsible for the glittering of air bubbles rising through water?
What was the chief objective of the 'Wahabi movement'?
What causes the mottling of the dental enamel?
Rajat has hypermetropia. What type of lens will the ophthalmologist recommend to correct his vision?
The impression of an image persists on the retina for about _________ of a second.
When light passes from one medium to another there is a change in its direction, this phenomenon is called ________.
An image formed by a plane mirror, that cannot be obtained on a screen is called _______.
What type of image formed by a concave mirror on the screen when the distance between object and mirror is higher than the focus?
Who first stated the principle of refraction that postulates that every substance has a specific bending ratio – 'refractive index'?
Convex and concave mirrors are examples of?
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:
