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Assignment for Class 10 Science Chapter 11 Human Eyes And Colourful World
Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 11 Human Eyes And Colourful World in Class 10. This test paper with questions and answers for Class 10 Science will be very useful for exams and help you to score good marks
Chapter 11 Human Eyes And Colourful World Class 10 Science Assignment
Question : The colored light that refracts most while passing through a prism is
a. Yellow
b. Violet
c. Blue
d. Red
Answer : B
Question : Stars appears to be twinkling because of
a. atmospheric refraction
b. reflection
c. Tyndall effect
d. spectrum
Answer : B
a. Black
b. Blue
c. Red
d. None of these.
a. Optic nerve
b. Shape of the crystalline lens
c. Focal length of the eye-lens
d. Opening of the pupil
a. independent of the thickness of the glass slab
b. None of these
c. is directly proportional to the thickness of the glass slab
d. inversely proportional to the thickness of the glass slab
Question : After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are:
a. ∠i and ∠r
b. ∠i and ∠e
c. ∠i, ∠e and ∠D
d. ∠i, ∠r and ∠e
Answer : C
Answer : A
Very Short Answer
Question : What would have been the colour of the sky, if the Earth had no atmosphere?
Answer : If the earth has no atmosphere, the sky would have appeared black because of no refraction.
Answer : The scattering of the light by particles, that it encounters in its path, is called Tyndall effect. When a beam of light enters a smoke-filled dark room through a small hole, then its path becomes visible to us. The tiny dust particles present in the air of room scatter the beam of light all around the room. Thus, scattering of light makes the particles visible. Tyndall effect can also be observed when sunlight passes through a canopy of a dense forest, where, the tiny water droplets in the mist scatter the light.
Question : Why is red color selected for danger signal lights?
Answer : Because the red light has the largest wavelength of all colors, it is the least dispersed. Because of this, much of the light gets reflected back and can travel longer distances through clouds, fog, dust etc. to effectively enter our eyes.
Question : Light of two colors A and B pass through a glass prism. A deviates more than B from its path of incidence. Which color has a higher speed in the prism?
Answer : Color B has higher speed than that of color A.
Question : How is the sense of vision carried from the eye to the brain?
Answer : Optic nerves carry sensation of vision from eye to brain.
Short Answer
i. Iris controls the size of pupil thus, monitoring the amount of light rays entering through pupil.
ii. Pupil is the aperture through which light enters and reach retina.c
iii. Cornea provides 67% of of eye's focussing power.
Question : What would have been the colour of the sky if there had not been any atmosphere around the earth?
Answer : black.
Question : For dispersion of light through a prism which colour has maximum deviation?
Answer : violet
Question : A person wears eye glass of focal length 70 cm what is the far point of the person?
Answer : 1/f=1/v-1/u
v=?
f=-70cm
u=-∞
1/-70=1/v-1/-∞
1/v=1/-70 v=-70cm.
Question : If your eye glasses have focal length 60cm what is your near point?
Answer : 1/f=1/v-1/u
1/60=1/v+1/25
v=-43cm.
Question : Why do we observe random wavering or flicking of the objects near a fire or on a very hot day?
Answer : Area above the fire is hot, and its density and hence refractive index changes frequently, therefore
apparent image of the object also changes.
Question : Why are we not able to see the things clearly when we come out of a darkroom?
Answer : When we are in dark, pupil size is bigger. As we come out of dark room,its size needs to become smaller. For that time-interval person is unable to see.
Question : A certain person has minimum distance of distinct vision of 150cm . He wishes to read at a
distance of 25cm. What focal length glass should he use? What is the nature of eye defect?
Answer : U=-25cm V=-150cm.
1/f=1/V-1/U
1/f=1/(-150) - 1/(-25)
f=30cm.
f being +ve, lense used is convex lens.
Hypermetropic
Question : Explain with the help of a diagram, how we are able to observe the sunrise about two minutes before the Sun gets above the horizon
Answer : The Sun can be seen about two minutes before sunrise because when the Sun is slightly below the horizon, the Sun’s light coming from less dense air to more dense air is refracted downwards as it passes through the atmosphere. Thus due to this atmospheric refraction, the Sun appears to be raised above the horizon when actually it is slightly below the horizon.
ii. The far point of a myopic eye is 60 cm. Find the focal length of the lens used to correct it.
Question : Explain why the planets do not twinkle but the stars twinkle?
Answer : The planets are much closer to the earth. A planet can be considered as a collection of large number of point-sized sources of light. So the total variation in the amount of light entering our eye from all the individual point-sized sources will average out to zero thereby nullifying the twinkling effect.
Long Answer
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CBSE Class 10 Science Chapter 11 Human Eyes And Colourful World Assignment
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Assignment for Science CBSE Class 10 Chapter 11 Human Eyes And Colourful World
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Chapter 11 Human Eyes And Colourful World Assignment Science CBSE Class 10
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Chapter 11 Human Eyes And Colourful World Assignment CBSE Class 10 Science
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CBSE Science Class 10 Chapter 11 Human Eyes And Colourful World Assignment
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