Q4 of 52 Page 431

When objects at different distances are seen by the eye, which of the following remain constant?

The actual image-distance from the eye-lens remains unchanged since the image is


formed on retina.


To view an object, the focal length of the eye-lens has to change and also , radii


of curvature of the eye-lens also changes. When the focal length changes, the object distance


also changes.

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2

The muscles of a normal eye are least strained when the eye is focussed on an object

 3

A normal eye is not able to see objects closer than 25 cm because

 5

A person A can clearly see objects between 25 cm and 200 cm. Which of the following may represent the range of clear vision for a person B having muscles stronger than A, but all other parameters of eye identical to that to A?

 6

The focal length of a normal eye-lens is about