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# Solutions 10. Light-Reflection and Refraction - Text-book Questions | Class 10 Science - Toppers Study

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## Solutions 10. Light-Reflection and Refraction - Text-book Questions | Class 10 Science - Toppers Study

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Chapter 10 Science class 10

### Text-book Questions class 10 Science Chapter 10. Light-Reflection and Refraction

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• Solution Chapter 10. Light-Reflection And Refraction Class 10
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• Chapter 10. Light-Reflection And Refraction Text-book Questions Class 10

## Solutions 10. Light-Reflection and Refraction - Text-book Questions | Class 10 Science - Toppers Study

Text-book Questions

Page no. 168

Q1. Define the principal focus of a concave mirror.

Q2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

Q3. Name a mirror that can give an erect and enlarged image of an object.

Q4. Why do we prefer a convex mirror as a rear-view mirror in vehicles?

Page no. 171

Q1. Find the focal length of a convex mirror whose radius of curvature is 32 cm.

Q2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?

Page no. 178

Q1. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?

Q2. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s–1.

Q3. Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.

Q4. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.

Q5. The refractive index of diamond is 2.42. What is the meaning of this statement?

Page no. 148

Q1. Define 1 dioptre of power of a lens.

Q2. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.

Q3. Find the power of a concave lens of focal length 2 m.