When you enter a dark room from bright sunlight outside, it takes some time to see items since your pupil is smaller due to the increased intensity of light outside. The pupil enlarges to make objects visible when we enter a dimly lit space.
Initially, we are unable to see anything well as we go into a darkened cinema hall from broad sunshine. But rapidly, our vision gets better. The iris ensures that the pupil is small because outside the cinema hall, the intensity of light entering the eye is very high. But as soon as we walk into the …
The amount of light that enters the eye is controlled by the iris. The size of the pupil is changed in response to how much light is received by the eye. If the intensity of the light received is high, the iris shrinks the size of the pupil, and if the intensity of the light …
How is the amount of light entering the eye controlled? Read More »
The ciliary muscles of the eye either become completely relaxed or stretched in order for an eye to focus on things that are located at various distances. The suspensory ligaments are made loose when the ciliary muscle contracts, allowing the focus on the objects in the nearby objects ,
a) When the eye is focused on a distant object, the eye’s focal length will be at its maximum.b) When the eye is focused on a nearby object, the eye-lens’ converging power will be at the maximum.
a) The eye lens thickens when the eye is focused on a close object. b) The eye lens becomes thinner when the eye is focused on a distant object.
As the eye’s accommodation range is limited to 25 cm, items positioned closer than that cannot be seen clearly by a normal eye. The ciliary muscles of the eye lens are not able to thicken once the eye’s maximum accommodation is reached.
a) Corneab) Retinac) Irisd) Large e) Light f) Eye-lens g) Thinner h) Thicker
a) Optical nerve b) Ciliary muscles c) Pupil d) Cornea e) Eye lens
The ability of an eye to focus both nearby as well as distant objects on the retina by adjusting the focal length of the lens is known as power of accommodation.
