Tag: human eye and its working

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Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Cilliary muscles in the eye:

  1. hold the eye lens in place

  2. increase or decrease focal length of eye lens.

  3. both (a) and (b)

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the ciliary muscle is relaxed, the choroid acts like a spring pulling on the lens via the zonule fibers causing the lens to become flat. When the ciliary muscle contracts, it stretches the choroid, releasing the tension on the lens and the lens becomes thicker. Cilliary muscles in the eye increase or decrease focal length of eye lens.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The nature of image formed on the retina of human eye is:

  1. virtual and erect

  2. virtual and inverted

  3. real and erect

  4. real and inverted
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Human eye lens are convex in nature and form real and inverted images and when the object is kept before the focus point and the centre of the lens it form virtual and erect images. The image formed on retina are real and inverted and further the message sent by the optic nerve are chemical impulses to the brain, which turn them into erect images that we see with our eyes.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Which of the following statements about human eye is NOT true?

  1. the iris gives a distinct colour to the eye

  2. the yellow spot is extremely sensitive to light

  3. the space between lens and cornea is filled with ciliary muscles

  4. the optic nerves enters the eye near the blind spot
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation


The space between the cornea and the lens is called the aqueous chamber and filled with thin watery transparent viscous fluid called aqueous humor which supplies nutrients to these structures as well as to the lens. Aqueous humour is produced by the ciliary processes in the posterior chamber and flows into the anterior chamber through the pupil.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The cornea gives the colour of the eye.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The iris gives eyes their color, depending on how much melanin it contains, similar to the pigment found in skin. Also helping to determine color is the iris's front layer, or stroma, which contains melanocyte cells that produce melanin, and fibers that scatter the light reflected outward.
Hence, the statement is false.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

There is a pattern observed in the number of sum spots appearing every year called as

  1. solar cycle

  2. sun spot cycle

  3. solar period

  4. solar spot cycle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sun spot cycle is a pattern observed in number of sun spots appearing every year due to revolution of earth arround sun with moon revolving earth.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

lens of an eye is a transparent spherical structure which :

  1. reflects light

  2. scatters light

  3. refracts light

  4. diffracts light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The lens is a transparent structure behind the iris, the coloured part of the eye. The lens bends light rays so that they form a clear image at the back of the eye – on the retina. As the lens is elastic, it can change shape, getting fatter to focus close objects and thinner for distant objects.