The following table gives values of refractive indices of a few media: 1 2 3 4 5 6 Medium Ice Water Kerosene Flint glass Ruby diamond Refractive index 1.31 1.333 1.44 1.66 1.71 2.42 Name the medium having the highest optical density and that having the lowest optical density.

The medium having higher refractive index is optically denser and that having lower refractive index is optically rarer. Thus, from the given data, diamond with refractive index 2 . 42 is having the highest optical density and ice with refractive index 1 . 31 has the lowest optical density.

Light is a source of energy that gives us the sensation of sight. It travels with a speed of 3 × 10 8 m s - 1 in vacuum and is a form of electromagnetic radiation as well as a non-mechanical wave.

E M B I B E

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 4

MEDIUM

10th CBSE

IMPORTANT

Earn 100

In the given diagram, what is point A called?

Important Questions on Light Reflection and Refraction

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10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 4

In the given diagram, which physical quantity does the reciprocal of the distance, between the device

X

and the point

A

, denote?

HARD

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 4

In the given diagram, write SI unit of the quantity denoted by the reciprocal of the distance between the device

X

and the point

A

.

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SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 5

A lens

X

has focal length

20 cm

and lens

Y

has focal length

40 cm

. Which lens would you select to obtain a more convergent beam of light and why?

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SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 5

The lower half of a convex lens is painted black, as shown. How will the intensity of the image be affected?
Question Image

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10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 5

The following table gives values of refractive indices of a few media:

	1	2	3	4	5	6
Medium	Ice	Water	Kerosene	Flint glass	Ruby	diamond
Refractive index	1.31	1.333	1.44	1.66	1.71	2.42

Name the medium having the highest optical density and that having the lowest optical density.

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SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 5

Why does a light ray striking a surface of a medium having different refractive index bend?

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10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 5

A pencil dipped in glass tumbler appears to be bent at the interface of air and water. Will it bend to the same extent when dipped in kerosene? Give reason.

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10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>MOCK TEST QUESTION PAPER>Q 1

What is light?