Human Eye and Colourful World

Metre is the unit of power of a lens.

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Power of a lens is the reciprocal of its focal length expressed in metre. It is measured in dioptres, denoted by D.

The ____ component of sunlight is least scattered during sunrise and sunset.

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Violet, blue, green component of sunlight which are of shorter wave length are scattered away during sunrise and sunset. Red colour is least scattered, hence, the Sun appears red during sunrise and sunset.

The light energy is converted into electrical signals by the retina, which reach the brain through ____.

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The electrical signals produced by the retina reaches the brain through optic nerves. The brain interprets the electrical signals and produces the sensation of vision.

The phenomenon of splitting of white light into its constituent colours, on passing through a prism is called ____.

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The phenomenon of splitting of white light into its constituent colours, on passing through a prism is called dispersion.

A transparent medium bounded by two plane surfaces inclined at an angle is known as a ____.

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A transparent medium bounded by two plane surfaces inclined at an angle is known as a prism.

Blue coloured light present in sunlight, is scattered ____ times more than the red light.

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Blue light has shorter wavelength, so it is scattered 10 times more than the red light.

Of all the sense organs, the ____ is the most significant part which enables us to see the beautiful world around us.

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Of all the sense organs, the eye is the most significant part which enables us to see the beautiful world around us.

The cornea protects and contains the internal parts of the eye.

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Sclera is a tough white fibrous tissue, that protects and contains the internal parts of the eye.

Rod cells in the retina are responsible for sensing light of less intensity.

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Rod cells in the retina are used for sensing light of less intensity.

The defect which cannot be corrected by placing a suitable lens before the eye-lens is ____.

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The defect of disturbed arrangement of proteins of which the eye-lens is made up, leading to an opaque eye-lens is called cataract. This defect is usually found in old age. It is corrected by surgical methods by replacing the affected lens by an artificial lens.

Our ____ can be considered as an optical device, that is, an instrument of vision that detects light.

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Our eyes can be considered as an optical device, that is, an instrument of vision that detects light.

The frequency of ____ colour of light is maximum and ____ colour of light is minimum.

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The frequency of violet colour of light is maximum and red colour is minimum.

Ciliary muscles relax to make the eye lens thin and focus a distant object on the retina.

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Ciliary muscles relax to make the eye lens thin and focus a distant object on the retina.

____ converts light energy into electric impulses.

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The retina converts light energy into electric impulses.

The near point of a normal human eye is ____.

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The minimum distance, at which objects can be seen most distinctly without strain, is called the least distance of distinct vision. It is also called the near point of the eye. The near point of a normal human eye is 25 cm.

Formation of a rainbow does not depend on ____.

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Formation of a rainbow depends on dispersion, total internal reflection and refraction but not on interference.

An isosceles glass prism having one angle 90° is called ____ prism.

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An isosceles glass prism having one angle 90° is called totally reflecting prism because, it turns the ray by 90° due to total internal reflection.

A human being has a horizontal view of 180° with a single eye.

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A human being has a horizontal view of 150° with a single eye.

The colour of the light that is scattered most does not depend on the size of the scattering particles.

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The colour of the light that is scattered most depends on the size of the scattering particles. Very fine particles scatter mainly blue light while particles of larger size scatter light of longer wavelengths.

The amount of light scattered, by air molecules increases with increase in wave length.

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The amount of light scattered, by air molecules increases with decrease in wavelength of light. Thus, blue light is scattered more than red light.

The delicate inner most light sensitive membrane of the eye on which image is formed is called ____.

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The delicate inner most light sensitive membrane of the eye on which image is formed is called retina.

The major part of the refraction of light entering the eye takes place at the ____.

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The major part of the refraction of light entering the eye takes place at the outer surface of the cornea.

We can see the Sun before the actual sunrise by about ____ minutes.

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We can see the Sun before the actual sunrise by about 2 minutes.

____ adjusts the size of pupil.

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Iris adjusts the size of pupil.

Stars would appear to twinkle if we view them from moon.

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Moon does not have atmosphere. So, stars would not appear to twinkle if viewed them from moon, since there is no atmospheric refraction.

The angle between the two refracting faces is known as the angle of deviation.

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The angle between the two refracting faces is called the angle of prism or the refracting angle.

The band of colours obtained by dispersion of light is called ____ of light.

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The band of colours obtained by dispersion of light is called spectrum of light.

Twinkling of stars, apparent sunrise and sunset can be explained by the phenomenon of ____.

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Twinkling of stars, apparent sunrise and sunset can be explained by the phenomenon of atmospheric refraction.

A ray of light bends more when it enters into a medium. The refractive index of that medium is low.

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According to Snell's law, refractive index is inversely proportional to the sine of angle of refraction.

Colour blindness is a defect created due to lack of some type of cone cells in the retina that respond to certain colours.

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Cone cells in the retina are sensitive to red, green and blue colours. The defect due to which a person is unable to differentiate between certain colours is called colour blindness.

CBSE Class 10th Science 11 - Human eye and colorful world MCQs
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