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NCERT Solutions Class 10 Science - Free PDF Download
Our NCERT for Class 10 Chapter 11 is complete package providing all topics, contents, problems, and most importantly self-explanatory solutions. NCERT Solutions for Class 10 Chapter 11 will help the students to solve all types of problems related to all the topics. myboat340 boatplans or the Toppr App provides you quality answers to all your questions related to the basic concepts of Physics.� We will help you to get complete NCERT Solutions for Class 10 Physics and other subjects. We are providing you the free PDF download links of the class 10 Chapter Toppr provides free study materials, + hours of video lectures, and last 10 years question papers for free. Download Toppr for Android and iOS or signup for free. Download NCERT Solutions for other subjects here. Free PDF download of NCERT Solutions for Class 10 Science (Physics) Chapter 11 - Human Eye and Colourful World solved by Expert Teachers as per NCERT (CBSE) Book guidelines. All Chapter 11 - Human Eye and Colourful World Exercise Questions with Solutions to help you to revise complete Syllabus and Score More marks.� Class 10 solutions help students to learn why different colours of light bend through various angles when they pass through a prism. Class 10 Science Chapter 11 The Human Eye and Colourful World - Weightage Marks. Chapter Human Eye and Colourful World is based on the structure of the human eye, functioning of each eye part, and methods to treat vision defects. In the annual examination, this unit holds a weightage of 4 marks. Get Free PDF Download of Chapter-wise NCERT solutions for class 10 science (Physics, Chemistry, and Biology) solved by expert teachers from latest edition NCERT books and as per NCERT (CBSE) Guidelines.� NCERT Solutions for Class 11 Political Science. NCERT Solutions for Class 11 Economics. NCERT Solutions for Class 11 Indian Economic Development. Class NCERT Solutions for Class 10 Maths.� These NCERT Class 10 Solutions of each chapter will almost represent your NCERT class 10 Science class notes, so read on for more updates on questions and answers. NCERT Solutions For Class 10 Science Chapter 1. Chemical Reactions and Equations chapter explains the concepts related to chemical reactions and equations.

Practicing NCERT class 10 science chapter 11 notes will help candidates to bag a good score in class 10 board exam. Further having good knowledge of the unit human eye and colorful world class 10 science NCERT Solutions will build a strong foundation in clearing the Engineering competitive exams as this unit comes under the subject Physics. The questions in each and every exercise of Human Eye and Colourful world comes with the answer and a detailed, step-by-step solution for better understanding by the student.

Question 1 What is meant by power of accommodation of the eye? Answer: The power of accommodation of the eye is the maximum variation of its power for focusing on near and far distant objects. Question 2 A person with a myopic eye cannot see objects beyond 1. What should be the type of the corrective lens used to restore proper vision? Answer: Concave lens. Question 3 What is the far point and near point of the human eye with normal vision?

Answer: For a human eye with normal vision the far point is at infinity and near point is 25 cm from the eye. Question 4 A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected? Answer: The child is suffering from myopia. The child should use concave lens of suitable focal length. Question 1 The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to a presbyopia b accommodation c near � sightedness d far � sightedness Answer: b Accommodation.

Question 2 The human eye forms the image of an object at its a cornea b iris c pupil d retina Answer: d Retina. Question 3 The least distance of distinct vision for a young adult with normal vision is about a 25 m b 2. Question 4 The change in focal length of an eye lens is caused by the action of the a pupil b retina c ciliary muscles d iris Answer: c Ciliary muscles.

Question 5 A person needs a lens of power What is the focal length of the lens required for correcting i distant vision, and ii near vision?

Question 6 The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem? Solution: The remedial lens should make the objects at infinity appear at the far point. Question 7 Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct the defect?

Assume that the near point of the normal eye is 25 cm. Solution: i The near point N of hypermetropic eye is farther away from the normal near point N. The object placed at 25 cm from the correcting lens must produce a virtual image at 1 m or cm.

Question 8 Why is a normal eye not able to see clearly the objects placed closer than 25 cm? Answer: At distance less than 25 cm, the ciliary muscles cannot bulge the eye lens any more, the object cannot be focused on the retina and it appears blurred to the eye, as shown in the given figure. Question 9 What happens to the image distance in the eye when we increase the distance of an object from the eye?

Answer: The eye lens of a normal eye forms the images of objects at various distances on the same retina. Therefore, the image distance in the eye remains the same. Question 10 Why do stars twinkle? Answer: Stars appear to twinkle due to atmospheric refraction. Stars are far away. So, they are the point source of light. As the path of light coming from stars keep changing, thus the apparent position of stars keep changing and amount of light from stars entering the eye keeps twinkling.

Due to which a star sometimes appear bright and sometimes dim, which is Ncert Solutions For Class 10th Science Chapter 11 Institution the effect of twinkling. Question 11 Explain why the planets do not twinkle? Answer: The planets are much nearer to the earth than stars and because of this they can be considered as large source of light. If a planet is considered to be a collection of a very large number of point sources of light, then the average value of change in the amount of light entering the eye from all point size light sources is zero.

Due to this the effect of twinkling is nullified. Question 12 Why does the sun appear reddish early in the morning? Most of the part of blue light and light of small wavelength gets scattered by dust particles near the horizon. So, the light reaching our eyes is of large wavelength.

Due to this the sun appears reddish at the time of sunrise and sunset. Question 13 Why does the sky appear dark instead of blue to an astronaut? Answer: As an astronaut moves away from the atmosphere of earth, the atmosphere becomes thin. Due to the absence of molecules or dust particles in air, the scattering of light does not take place. Thus, sky appears dark in the absence of scattering. Functioning of a lens in human eye, defects of vision Ncert Solutions For Class 10th Science Chapter 1 University and their corrections, applications of spherical mirrors and lenses.

Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life. Formulae Handbook for Class 10 Maths and Science. Question 1. What is meant by power of accommodation of the eye? Answer: The power Of accommodation of the eye is the ability of the eye to observe the distinct objects clearly which are situated at a large distance from the eye.

The ciliary muscles are responsible to change the focal length Of the eye lens. The value of power of accommodation Of human eye is about 4D. Question 2. A person with a myopic eye cannot see objects beyond 1.

Answer: The far point for myopic eye is 1. Question 3. What is the far point and near point of the human eye with normal vision? Answer: For human eye with normal vision, far point is at infinity and near point is at 25 cm from the eye. Question 4. A student has difficulty reading the blackboard while sitting in the last row. Answer: As the child has difficulty in reading the blackboard, he is suffering from myopia or short sightedness.

To correct this defect, he has to use spectacles with concave lens of suitable focal length. Page � Question 1. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to a presbyopia b accommodation c near-sightedness d far-sightedness Answer: b Human eye can change the focal length of the eye lens to see the objects situated at various distances from the eye.

This is possible due to the power of accommodation of the eye lens. The human eye forms the image of an object at its a cornea b iris c pupil d retina Answer: d The human eye forms the image of an object at its retina. The least distance of distinct vision for a young adult with normal vision is about a 25 m b 2.

It is 25 cm for a young adult with normal visions. The change in focal length of an eye lens is caused by the action of the a pupil b retina c ciliary muscles d iris Answer: c The relaxation or contraction of ciliary muscles changes the curvature of the eye lens. The change in curvature of the eye lens changes the focal length of the eyes. Hence, the change in focal length of an eye lens is caused by the action of ciliary muscles.

Question 5. A person needs a lens of power � 5. Question 6. The far point of a myopic person is 80 cm in front of the eye. Question 7. Make a diagram to show how hypermetropia is corrected. Assume that near point of the normal eye is 25 cm. Question Why do stars twinkle? Answer: The stars twinkle at night, because the star light reaching Our eyes increases and decreases continuously due to atmospheric refraction.

When star light reaching our eyes increases, the star looks bright and when the star light reaching our eyes decreases, it appears dim.

Explain why the planets do not twinkle? Answer: Planets being close to earth appear larger in size. A planet can be Considered as a collection of large number of small sized objects.

Twinkling effect Of these objects cancel each other. Why does the sun appear reddish early in the morning? Answer: At sunrise, the sun looks almost reddish because only red colour which is least scattered is received by our eye and appears to come from sun.

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