Attempt either (a) or (b) : (a) How does the focal length of eye lens change as the distance of the object…
Attempt either (a) or (b) :
(a) How does the focal length of eye lens change as the distance of the object from the eyes is altered ? Explain.
Solution
(a)
• If the distance of the object from the eye is increased, ciliary
muscles relax, lens becomes thin and so the focal length
increases.
• If the distance between the object from the eye is decreased,
the ciliary muscles contract, lens becomes thick and the focal
length decreases.
OR
(b) In myopic eye image is formed in front of the retina. A
concave lens / diverging lens of suitable power will bring
the image back on to the retina.