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Balbharati solutions for Class 10th Board Exam Science and Technology - 1 chapter 7 - Lenses

Chapter 7: Lenses

Chapter 7: Lenses solutions [Page 92]

Q 1 | Page 92

Match the columns in the following table and explain them.

 Column 1 Column 2 Column 3 Farsightedness Nearby object can be seen clearly Bifocal lens Presbyopia Far away object can be seen clearly Concave lens Nearsightedness Problem of old age Concave lens
Q 2 | Page 92

Draw a figure explaining various terms related to a lens.

Q 3 | Page 92

At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.

Q 4.1 | Page 92

Give scientific reason:
Simple microscope is used for watch repairs.

Q 4.2 | Page 92

Give scientific reason:
One can sense colours only in bright light.

Q 4.3 | Page 92

Give scientific reason:

We cannot clearly see an object kept at a distance less than 25 cm from the eye.

Q 5 | Page 92

Explain the working of an astronomical telescope using refraction of light.

Q 6.1 | Page 92

Distinguish between Farsightedness and Nearsightedness.

Q 6.2 | Page 92

Distinguish between Concave lens and Convex lens.

Q 7 | Page 92

What is the function of iris and the muscles connected to the lens in human eye?

Q 8.1 | Page 92

Solve the following example.
Doctor has prescribed a lens having power +1.5 D. What will be the focal length of the lens? What is the type of the lens and what must be the defect of vision?

Q 8.2 | Page 92

Solve the following example.
5 cm high object is placed at a distance of 25 cm from a converging lens of focal length of 10 cm. Determine the position, size and type of the image.

Q 8.3 | Page 92

Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row. What is the total power of the lens combination?

Q 8.4 | Page 92

An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens?

Balbharati solutions for Class 10th Board Exam Science and Technology - 1 chapter 7 - Lenses

Balbharati solutions for Class 10th Board Exam Science and Technology - 1 chapter 7 (Lenses) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board SCC Class 10 Science and Technology part 1 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. Balbharati textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 10th Board Exam Science and Technology - 1 chapter 7 Lenses are Persistence of Vision, Use of Convex Lenses, Use of Concave Lenses, Presbyopia, Farsightedness Or Hypermetropia, Nearsightedness/ Myopia, Defects of Vision and Their Corrections, Concept of Human Eye, Combination of Lenses, Power of a Lens, Lens Formula and Magnification, Sign Convention, Images Formed by Concave Lenses, Lenses.

Using Balbharati Class 10th Board Exam solutions Lenses exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Balbharati Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board Class 10th Board Exam prefer Balbharati Textbook Solutions to score more in exam.

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