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Chemistry of Vision

a)What is mea...

Question

a)What is meant by power of accomodation of eye?
b)How does focal length of the eye lens change when we shift looking from a distant object to a nearby object?

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Solution

Dear Student!
Muskan has given the right answer.
It is because of this power of accomodation of lens that it changes its focal length.

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Q. The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case :
(a) the focal length of eye-lens will be the maximum ?
(b) the converging power of eye-lens will be the maximum ?

When the eye is looking at a distant object, then the focal length of the eye:

Fill in the blanks:

For a human eye lens, for nearby objects, focal length ____ while for far away objects focal length ____ .

Q. The ability of an eye to adjust its focal length by itself to see nearby and distant objects is called as ______________.

Q. A simple telescope, consisting of an objective of focal length

60 c m

and a single eye lens of focal length

5 c m

is focused on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle

2^{o}

at the objective, the angular width of the image:

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