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
The color order in a secondary rainbow is:
The minimum number of rays required to locate the image formed by a spherical mirror is _____.
Important Questions from Optics
Which one of the following colours may be obtained by combining green and red colours?
Which of the following are the primary colours of light?
Directions: The following items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below:
Statement I: Diamond is very bright.
Statement II: Diamond has very low refractive index
A non-SI unit called 'nit' is the unit of which of the following photometric quantities used to measure a multitude of light intensity?
Which among the following is used as a reflector in search lights?
