Test: Human Eye

10 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Test: Human Eye

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The human eye forms the image of an object at its


Retina is the inner back portion of eye. Retina is composed of enormous number of light sensitive cells. Lens forms image of the visual world on retina through cornea. Light sensitive cells of retina get activated upon illumination and generate electric signals. Optic nerves send these electric signals to the brain, where these signals finally processed and interpreted to see an object as they are.


The light coming from an object enters the eye through:


Light enters the eye through the cornea. ... From the cornea, the light passes through the pupil. The iris, or the colored part of your eye, controls the amount of light passing through. From there, it then hits the lens.


Light from an object enters the eye through the pupil and travels to the back of the eye, forming an image on the retina. What is the orientation of the retinal image, as compared to that of the original object ?


The image will be upside down. As it passes the lens, it gets inverted.


The change in the focal length of an eye lens is caused by the action of


The ciliary muscles change the focal length of the eye lens by changing its shape.


The fluid between the retina and the lens is called


The space between the lens and the retina is called Vitreous Body and is filled with a transparent gel called Vitreous Humorous.


As we increase the distance of an object from the eye, the image distance:


There is no change to image distance in the eye when we increase the distance of an object from the eye. To see closer or distant object clearly, the eyes, due to its accommodation, can increase or decrease the focal length of its lens, so that the image is always formed at retina. The eye lens is composed of fibrous, jelly like material. To see closer or distant objects, focal length of its lens can be increased or decreased to some extent by contraction and relaxation of ciliary muscles.  


Ability of the eye to see objects at all distances is called


Changes in contraction of the ciliary muscles alter the focal distance of the eye, causing nearer or future images to come into focus on the retina; this process is known as accommodation.


The focal length of the eye lens increases when eye muscles


The focal length of the eye lens increases when eye muscles relaxed and becomes thinner. The sharp image of the distant object is formed at the retina. This enables us to focus accurately on distant objects.


Electric nerve impulses from the retina to brain are conveyed by


The lens in turn focuses the light rays onto the retina, lining the back of the eye. The retina converts the image formed by the light rays into nerve impulses. The optic nerve, composed of the axons of the retina's ganglion cells, then transmits these impulses from the eye to the first visual relay in the brain.


The combination responsible for admitting different amounts of light into eye is


The function of pupil is to control the amount of light entering the eye and the iris controls the pupil.

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