Class 10 Exam  >  Class 10 Questions  >   Read the passage in the human eye and answer... Start Learning for Free
Read the passage in the human eye and answer the questions.
Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.
The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects is
  • a)
    0.75 D and +4 D
  • b)
    +2D and – 1/3 D
  • c)
    – 2.5D and + 1/8D
  • d)
    0.85 D and – 2 D
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Read the passage in the human eye and answer the questions.Eye is a n...
Let the object distance = u
View all questions of this test
Most Upvoted Answer
Read the passage in the human eye and answer the questions.Eye is a n...
Explanation:


The given passage discusses the human eye and its defect of vision. Meena was unable to see clearly the words written on the blackboard placed at a distance of approximately 3 m from her. The doctor explained the correction of this defect of vision.

Correction of Defective Eye:


The defective eye of a person has a near point of 0.5 m and a far point of 3 m. To correct this defect of vision, a lens is used which is placed in front of the eye. This lens helps in focusing the light on the retina of the eye and hence helps in forming a clear image.

Power of Lens Required:


The power of the lens required for reading purpose can be calculated using the formula:

Power of lens = 1 / focal length

Where,

Focal length = near point of eye

Power of lens required for reading purpose = 1 / 0.5 m = 2 D (option B)

Similarly, the power of lens required for seeing far off objects can be calculated using the formula:

Power of lens = 1 / focal length

Where,

Focal length = far point of eye

Power of lens required for seeing far off objects = 1 / 3 m = 1/3 D

Therefore, the power of both lens required for reading purpose and seeing far off objects is 2 D and – 1/3 D respectively, which is option B.
Attention Class 10 Students!
To make sure you are not studying endlessly, EduRev has designed Class 10 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 10.
Explore Courses for Class 10 exam

Top Courses for Class 10

Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer?
Question Description
Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 10. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free.
Here you can find the meaning of Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Read the passage in the human eye and answer the questions.Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects isa)0.75 D and +4 Db)+2D and – 1/3 Dc)– 2.5D and + 1/8Dd)0.85 D and – 2 DCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Class 10 tests.
Explore Courses for Class 10 exam

Top Courses for Class 10

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev