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Chapter 7: Lenses
Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board Chapter 7 Lenses Exercises [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 | Convex lens |
Draw a figure explaining various terms related to a lens.
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.
Give scientific reason.
Simple microscope is used for watch repairs.
Give scientific reason:
One can sense colours only in bright light.
Give scientific reason:
We cannot clearly see an object kept at a distance less than 25 cm from the eye.
Explain the working of an astronomical telescope using refraction of light.
Distinguish between:
Farsightedness and Nearsightedness.
Distinguish between:
Concave lens and Convex lens.
What is the function of iris and the muscles connected to the lens in human eye?
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?
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.
Solve the following example.
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?
Solve the following example.
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?
Chapter 7: Lenses
Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board chapter 7 - Lenses
Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board 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 Science and Technology Part 1 10th Standard SSC Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster.
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Concepts covered in Science and Technology Part 1 10th Standard SSC Maharashtra State Board chapter 7 Lenses are Power of a Lens, Eye Defect and its correction: Hypermetropia or far-sightedness, Eye Defect and Its Correction: Presbyopia, Convex Lens, Concave Lens, Images Formed by Sperical Lenses, Lens, Spherical Lens, Guideline for Image Formation Due to Refraction Through a Convex and Concave Lens, Images Formed Due to Refraction Through a Concave Lens, Images Formed Due to Refraction Through a Convex Lens, Sign Convention for Spherical Lenses, Lens Formula, Magnification Due to Spherical Lenses, Combination of Lenses, Human Eye: Structure of the Eye, Working of the Human Eye, Eye Defect and Its Correction: Myopia Or Near-sightedness.
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