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Worksheet for Class 10 Science Chapter 11 Human Eye and Colourful World
Class 10 Science students should refer to the following printable worksheet in Pdf for Chapter 11 Human Eye and Colourful World in Class 10. This test paper with questions and answers for Class 10 will be very useful for exams and help you to score good marks
Class 10 Science Worksheet for Chapter 11 Human Eye and Colourful World
1.A prism is a transparent refracting medium bounded by two plane surfacesinclined to each other at a certain angle. The refraction of light through a prism follows the laws of refraction. In the prism, refraction takes place on its refracting surface it means when the light enters the prism and when the light leaves the prism. The refraction through a prism is shown. Here, <A is the angle of prism, ∠ i is the angle of incidence of the face AB and ∠e is th
The incident ray suffers a deviation or bending through an angle δ due tothe refraction through prism. This angle is called angle of deviation as shown in figure.
i + e = δ + A
Question : The angle between the two refracting surfaces of a prism is called
(a) angle of prism
(b) angle of incidence
(c) angle of deviation
(d) angle of emergence
Answer : A
Question : The angle between the incident ray and the emergent ray is called
a) angle of emergence
(b) angle of deviation
(c) angle of incidence
(d) none of these
Answer : B
Question : When a ray is refracted through a prism, then
(a) ∠ ∠δ
(b) ∠ i=∠e+∠δ
(c) ∠δ= ∠e
(d) ∠i > ∠r
Answer : D
Question : The angle of deviation depends on
(a) refractive index of prism
(b) angle of incidence
(c) both (a) and (b)
(d) none of these
Answer : C
Very Short Answers
Question : What would have been the colour of sky if the earth had no atmosphere?
Answer : The sky would have looked dark if the earth had no atmosphere as there would not have been any scattering.
Question : Which great scientist was colour blind?
Answer : Dalton was colour blind.
Question : On what factor does colour of scattered light depend?
Answer : The colour of scattered light depends on the size of the scattering particle. Very fine particles scatter mainly blue light whereas particles of larger size scatter light of longer wavelengths.
Question : Why is a small amount of sodium thiosulphate added to water in tank in the activity to understand reddish appearance of sun at sunrise and sunset?
Answer : Sodium thiosulphate is added to water in the tank for precipitating minute colloidal sulphur particles which scatter short wavelengths of light.
Question : Which part of the human eye helps in changing the thickness of lens?
Answer : Ciliary muscles
Question : Name the light sensitive part of the eye where image of an object is formed.
Answer : Retina
Question : Which is the range of vision of normal eye?
Answer : 25 cm to infinity.
Question : What are light sensitive cells?
Answer : Rods and cones.
Question : What type of image is formed on the retina?
Answer : Real, inverted image.
Question : Define least distance of distinct vision.
Answer : The minimum distance at which the objects can be seen clearly without any strain is called least distance of distinct vision. It is the near point of eye and is equal to 25 cm.
Question : What is spectrum?
Answer : The band of seven colours obtained due to the dispersion of white light is called spectrum.
Question : What is Tyndall effect?
Answer : Scattering of light in the nature due to small particles present in the atmosphere is called Tyndall effect.
Question : Define the power of accommodation of human eye.
Answer : The ability of eye to see nearby as well as far off objects at the same time is called power of accommodation.
Question : Name the disease in which crystalline lens of human eye becomes opaque.
Answer : Cataract.
Question : What is the diameter of human eye?
Answer : 2.3 cm
Question : In which type of eye defect far point of the eye gets reduced?
Answer : Myopia.
Question : What type of lens should be used to correct the presbyopia?
Answer : Bi-focal lens. Concave-convex lens.
Question : The image formed on retina is inverted but we see the object erect. Why?
Answer : The image formed on retina is inverted, this image is formed on the light sensitive cells called rods and cones of the retina which generates electrical signals. This signal reaches brain via optic nerve. It is the brain that interprets this image and while processing the image it helps in perceiving objects as they are.
Question : Why danger signals are red?
Answer : Danger signals are of red colour, as it scatters the least and can be seen from the maximum distance.
Question : Why does sky look blue on a clear day?
Answer : White light scatters due to atmospheric refraction. White light is made up of seven colours out of which, blue light scatters the most hence the sky looks blue.
Question : Why do you take time to see objects when you enter a dim lighted room from outside in the sun?
Answer : In the sun light the size of pupil, is small but when one enters the dim light, it takes some time for iris to adjust the size of pupil and the light sensitive cells take some time to get activated.
Question : When white light enters the prism, which colour of light deviates/bends the least and which colour bends the most?
Answer : The light that bends the least is red colour and the light that bends the maximum is violet colour light.
Question : Why can’t we see object very close to our eye?
Answer : The objects are seen only when the image forms on retina when the light rays pass through the lens. The lens has its fixed ability of changing the focal length with the help of ciliary muscles.
Ciliary muscles cannot be contracted beyond a certain limit to change the focal length of eye lens. The objects kept very close to our eye cannot be focused by ciliary muscles.
Question : Why does a ray of light splits into different colours on passing through a glass prism?
Answer : When light rays enter the glass prism the angle at which it bends makes the light split into its seven components because the speed of each component of light is different and due to the bending every component shows its different ability to pass through it.
Question : Why do birds fly back to their nest in the evening?
Answer : Birds lack light sensitive cells called rods, due to lack of these cells they cannot see the objects clearly in less/dim light.
Question : In dispersion of white light through prism, which colour deviates most and which colour the least? Why do they deviate differently?
Answer : The colour of light that deviates least is red and violet deviates the maximum. The difference in deviation is due to the difference in wavelength and speed of each colour of light, also due to different bending ability when it passes through the prism.
Question : What is hypermetropia? How can it be corrected?
Answer : Hypermetropia is an eye defect also called as long-sightedness. Person can see a far off objects but cannot see nearby objects. It is because the image is formed beyond retina.
Cause – (a) The focal length of the eye lens is too long.
(b) The eyeball has become too small.
Correction: It can be corrected by using convex lens of appropriate power.
Question : What is the direction of rainbow formation? What is the position of red colour in rainbow?
Answer : Rainbow is always formed in the direction opposite to sun. The position of red colour in the rainbow is at the top.
Question : A short-sighted person cannot see clearly beyond 5 cm. Calculate the power of lens required to correct his vision to normal?
Answer : f = – 5 cm
P= 1/f = −(1/5)
∴ Power = 0.2 Dioptre
Question : Why are two eyes more helpful for us to see as compared to one?
Answer : Two eyes are more helpful as one eye gives only a view of 150° angle where as two eyes increase the view by making it wide to 180° angle. Two eyes also helps us to see the objects in dim light or darkness clearly. Two eyes give stereoscopic vision helping us assess the depth of vision.
Assume that the near point of the normal eye is 25 cm.
Answer : There are two effects produced due to scattering of light in the atmosphere: tyndall effect and appearance of the blue colour of the sky. Related Theory When light moves from one medium to another, the light scatters in different directions due to change in the medium. This is called scattering of light. When tiny particles of dust come in front of light and leads to its scattering, this is called tyndall effect. We can see these tiny dust particles in the scattered light.
When the light from stars enters the atmosphere, the light with smaller wavelengths gets easily scattered, while lights with longer wavelength do not scatter much and hence travels straight. This gives red colour to the sky during sunrise and sunset. On the other hand, the shorter wavelengths scatter in the sky and give the sky its usual blue colour.
Answer : For the myopic eye
Answer : Human eye is the most remarkable and most delicate optical instrument.
Question : What is meant by power of accommodation of the eye?
Question : Define the following terms- a)Persistence of vision b) Far point of the eye c)Near point of the eye d)Least distance of distinct vision
Question : What is the condition of the ciliary muscles of the eye when the eye is looking at a distant object. What is its effect on the focal length of the eye lens?
Question : Why are we not able to see things clearly for some time when we enter fro bright light to a darkened cinema hall?
Question : A student has difficulty in reading the blackboard while sitting on the last desk. From what defect of vision is he suffering? How can it be corrected? Draw ray diagram for it.
Question : What happens to the image distance in the eye when we increase the distance of an object from the eye?
Question : What do you mean by dispersion?
Question : Why do different colours deviate through different angles on passing through a prism?
Question : How do we see colours?
Question : Why does the sky appear dark instead of blue to an astronaut?
Question : Why does the sun appear reddish early in the morning?
Question : Explain the formation of a rainbow.
Question : What is the cause of twinkling of stars?
Question : Why are danger signal lights red in colour?
Question : What information do we get about sunlight from the formation of a rainbow?
Question : Why does the sun appear red at sunrise and sunset?
Question : What are ‘bifocal’ lenses?Under what condition(s) are these required by a person?
Question : A person with a myopic eye cannot see objects beyond 1.2m distinctly. What should be the nature of corrective lens to restore proper vision? (P= -0.83 Lens – concave)
Question : The near point of a hypermetropic eye is at 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book held at 25 cm from the eye? (P= 2.66D)
Question : A myopic person uses specs of power – 0.5D. What is the distance of far point of his eye? (2m)
Question : A person wants to read a book placed at 20 cm, whereas near point of his eye is 30 cm. calculate the power of the lens required (1.67D).
Question : The far point distance of a short sighted person is 1.5meters. find the focal length, power and nature of the remedial lens? (-1.5 m, -0.67D, concave lens)
Question : A person having a myopic eye uses a concave lens of focal length 10 cm. Find the power of the lens. (-10D)
Question : A person with myopic eyes is nit able to see objects beyond 3 m. determine the nature, focal length and power of the correcting lens? (divergent, -3m,-3.3D)
Question : A person can see clearly up to 3m. Name the defect of vision he is suffering from. What type of lens should be used so that he can clearly see up to 12m.find its power. (-0.25D)
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CBSE Class 10 Science Chapter 11 Human Eye and Colourful World Worksheet
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Worksheet for Science CBSE Class 10 Chapter 11 Human Eye and Colourful World
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Chapter 11 Human Eye and Colourful World worksheet Science CBSE Class 10
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Chapter 11 Human Eye and Colourful World CBSE Class 10 Science Worksheet
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Worksheet for CBSE Science Class 10 Chapter 11 Human Eye and Colourful World
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