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Is the colour of 620 nm light and 780 nm light same? Is the co
Concepts of Physics by H. C. Verma
Concepts of Physics

Class 11

HC Verma Part I

Author:
H. C. Verma
Subject:
Physics
1

Chapter 1: Introduction to Physics

35 questions

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2

Chapter 2: Physics and Mathematics

60 questions

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3

Chapter 3: Rest and Motion: Kinematics

88 questions

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4

Chapter 4: The Forces

33 questions

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5

Chapter 5: Newton's Law of Motion

82 questions

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6

Chapter 6: Friction

57 questions

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7

Chapter 7: Circular Motion

63 questions

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8

Chapter 8: Work and Energy

101 questions

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9

Chapter 9: Centre of Mass, Linear momentum Collision

119 questions

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10

Chapter 10: Rotational Mechanics

149 questions

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11

Chapter 11: Gravitation

80 questions

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12

Chapter 12: Simple Harmonic Motion

111 questions

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13

Chapter 13: Fluid Mechanics

81 questions

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14

Chapter 14: Some Mechanical Properties of Matter

87 questions

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15

Chapter 15: Wave Motion and Waves on a String

96 questions

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16

Chapter 16: Sound Waves

118 questions

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17

Chapter 17: Light Waves

79 questions

Q1
Is the colour of 620 nm light and 780 nm light same? Is the colour of 620 nm light and 621 nm light same? How many colours are there in white light?
Q2
The wavelength of light in a medium is where is the wavelength in vacuum. A beam of red light enters water. The wavelength in water is To a person under water, does this light appear green?
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18

Chapter 18: Geometrical optics

123 questions

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19

Chapter 19: Optical Instruments

52 questions

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20

Chapter 20: Dispersion and Spectra

27 questions

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21

Chapter 21: Speed of Light

14 questions

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22

Chapter 22: Photometry

38 questions

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Question
Easy
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Is the colour of 620 nm light and 780 nm light same? Is the colour of 620 nm light and 621 nm light same? How many colours are there in white light?

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Book:

Concepts of Physics (HC Verma Part I)

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Text SolutionText solutionverified iconVerified

White light is a composition of seven colours. These are violet, indigo, blue, green, yellow, orange and red, collectively known as VIBGYOR. Spectrum of white light consists of  sever colour bands. Each band consists of some range of wavelengths or frequencies.
For orange colour : (590 nm to 620 nm)
For red colour: (620 nm to 780 nm)

So, the colour of 620 nm and 780 nm lights may be different. But the colour of 620 nm light and 621 nm light is same.
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Practice questions from Concepts of Physics (HC Verma Part I)

Question 1
Easy
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The speed of yellow light in a certain liquid is 2.4 × 10 m s. Find the refractive index of the liquid.
Topic

Topic:

Wave Optics

Book

Book:

Concepts of Physics (HC Verma Part I)

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Question 2
Hard
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Consider the arrangement shown in the figure. By some mechanism, the separation between the slits  and   can be changed. The intensity is measured at the point P, which is at the common perpendicular bisector of   . When the intensity measured at P is I. Find the intensity when z is equal to

(a)

(b)   and

(c)
Topic

Topic:

Wave Optics

Book

Book:

Concepts of Physics (HC Verma Part I)

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Question 3
Medium
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The wavefronts of a light wave travelling in vacuum are given by x + y + z = c. The angle made by the direction of propagation of light with the X-axis is _________ .
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Wave Optics

Book

Book:

Concepts of Physics (HC Verma Part I)

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Question 4
Easy
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Two narrow slits emitting light in phase are separated by a distance of 1⋅0 cm. The wavelength of the light is The interference pattern is observed on a screen placed at a distance of 1.0 m.
(a) Find the separation between consecutive maxima. Can you expect to distinguish between these maxima?
(b) Find the separation between the sources which will give a separation of 1.0 mm between consecutive maxima.
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Topic:

Wave Optics

Book

Book:

Concepts of Physics (HC Verma Part I)

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Question Text
Is the colour of 620 nm light and 780 nm light same? Is the colour of 620 nm light and 621 nm light same? How many colours are there in white light?
TopicWave Optics
SubjectPhysics
ClassClass 12
Answer TypeText solution:1
Upvotes9