Find out, from the table, the medium having the highest optical density. Also, find the medium with the lowest optical density. Material medium Refractive index Material medium Refractive index Air 1 . 0003 Crown glass 1 . 52 Ice 1 . 31 Canada Balsam 1 . 53 Water 1 . 33 Rock Salt 1 . 54 Alcohol 1 . 36 Carbon disulphide 1 . 63 Kerosene 1 . 44 Dense flint glass 1 . 65 Fused Quartz 1 . 46 Ruby 1 . 71 Turpentine oil 1 . 47 Sapphire 1 . 77 Benzene 1 . 50 Diamond 2 . 42

Diamond has the highest optical density with refractive index 2 . 42 . Air has the lowest optical density with refractive index 1 . 0003 .

You are given kerosene, turpentine, and water. In which of these does the light travel fastest? Use the information given in the table. Material medium Refractive index Material medium Refractive index Air 1 . 0003 Crown glass 1 . 52 Ice 1 . 31 Canada Balsam 1 . 53 Water 1 . 33 Rock Salt 1 . 54 Alcohol 1 . 36 Carbon disulphide 1 . 63 Kerosene 1 . 44 Dense flint glass 1 . 65 Fused Quartz 1 . 46 Ruby 1 . 71 Turpentine oil 1 . 47 Sapphire 1 . 77 Benzene 1 . 50 Diamond 2 . 42

Light travels faster in a medium with the lowest refractive index. From the table, since the water has the lowest refractive index, light travels faster in water compared to kerosene and turpentine oil.

MEDIUM

10th Mizoram Board

IMPORTANT

Earn 100

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

Important Questions on Light - Reflection and Refraction

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 4

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

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 1

Find the focal length of a convex mirror whose radius of curvature is

32 c m

MEDIUM

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 2

A concave mirror produces three times magnified (enlarged) real image of an object placed at

10 c m

in front of it. Where is the image located?

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 1

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?

MEDIUM

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 2

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 a vacuum is

3 \times 10^{8} \frac{m}{s}

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 3

Find out, from the table, the medium having the highest optical density. Also, find the medium with the lowest optical density.

Material medium	Refractive index	Material medium	Refractive index
Air	$1.0003$	Crown glass	$1.52$
Ice	$1.31$	Canada Balsam	$1.53$
Water	$1.33$	Rock Salt	$1.54$
Alcohol	$1.36$	Carbon disulphide	$1.63$
Kerosene	$1.44$	Dense flint glass	$1.65$
Fused Quartz	$1.46$	Ruby	$1.71$
Turpentine oil	$1.47$	Sapphire	$1.77$
Benzene	$1.50$	Diamond	$2.42$

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 4

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

Material medium	Refractive index	Material medium	Refractive index
Air	$1.0003$	Crown glass	$1.52$
Ice	$1.31$	Canada Balsam	$1.53$
Water	$1.33$	Rock Salt	$1.54$
Alcohol	$1.36$	Carbon disulphide	$1.63$
Kerosene	$1.44$	Dense flint glass	$1.65$
Fused Quartz	$1.46$	Ruby	$1.71$
Turpentine oil	$1.47$	Sapphire	$1.77$
Benzene	$1.50$	Diamond	$2.42$

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 5

The refractive index of diamond is

2.42

. What is the meaning of this statement?

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

Important Questions on Light - Reflection and Refraction

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