# Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board chapter 7 - Lenses [Latest edition]

## Chapter 7: Lenses

Exercises
Exercises [Page 92]

### Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board Chapter 7 Lenses Exercises [Page 92]

Exercises | 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 Convex lens
Exercises | Q 2 | Page 92

Draw a figure explaining various terms related to a lens.

Exercises | 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.

Exercises | Q 4.1 | Page 92

Give scientific reason.

Simple microscope is used for watch repairs.

Exercises | Q 4.2 | Page 92

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

Exercises | 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.

Exercises | Q 5 | Page 92

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

Exercises | Q 6.1 | Page 92

Distinguish between:

Farsightedness and Nearsightedness.

Exercises | Q 6.2 | Page 92

Distinguish between:

Concave lens and Convex lens.

Exercises | Q 7 | Page 92

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

Exercises | 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?

Exercises | 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.

Exercises | Q 8.3 | Page 92

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?

Exercises | Q 8.4 | Page 92

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?

Exercises

## 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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