Concave lens also called as diverging lens is used in the type of defects in which the eye is unable to see nearby objects because of the image formation in front of the retina rather than on the retina, hence the defect is Myopia or near sightedness.
(c) The least distance of distinct vision is the minimum distance of an object to see clear and distinct image. It is 25 cm for a young adult with normal...
The defects of the eye due to which a person is unable to distinguish between certain colors is known as color blindness. Cone shaped retinal cells are responsible for making...
A hypermetropic eye can have a normal far point. If he uses spectacles of the converging lens, he will have more converging power than needed for parallel rays so the...
(c) increases
EXPLANATION:
The focal length F of the combination is given as 1/F = 1/f₁ + 1/f₂
It is like resistors connected in parallel. The numerical value of equivalent resistance is less...
The air blown from the mouth is hot and the glass of the spectacles is comparatively colder. The hot air we breathe out contains water vapours which turn into tiny...
