10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Human Eye
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Detailed Solution for Test: Human Eye - Question 1
The retina is the inner back portion of the eye. It is composed of an enormous number of light-sensitive cells.
The lens forms an image of the visual world on the retina through the cornea.
Light-sensitive cells of the 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:
Detailed Solution for Test: Human Eye - Question 2
Light enters the eye through the cornea and 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 ?
Detailed Solution for Test: Human Eye - Question 3
The image will be upside down. As it passes the lens, it gets inverted.
As we increase the distance of an object from the eye, the image distance:
Detailed Solution for Test: Human Eye - Question 6
There is no change to the image distance in the eye when we increase the distance of an object from the eye.
To see closer or distant objects clearly, the eyes, due to their accommodation, can increase or decrease the focal length of its lens, by contraction and relaxation of ciliary muscles, so that the image is always formed at the retina.
The focal length of the eye lens increases when eye muscles
Detailed Solution for Test: Human Eye - Question 8
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.
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