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with
ABHISHEK K RB.Tech - Aerospace, Alliance University
The Colourful World
IN ONE SHOT
CBSE Expert | Inventor of RocketPro
6+ Years Teaching Exp | Mentored more than 5000 students
Helped 1000s of students get 10 CGPA in CBSE X
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CO
LOU
RF
UL
WO
RLD
Refraction through a Prism
Scattering of Light
Dispersion through a Prism
TIR & Rainbow formation
Atmospheric Refraction & its applications
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CO
LOU
RF
UL
WO
RLD
Refraction through a Prism
Scattering of Light
Dispersion through a Prism
TIR & Rainbow formation
Atmospheric Refraction & its applications
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Q10. Two lenses have power of +2D and-6D respectively. Calculate the focallength of the combination?
Answer : -0.25 m
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Refraction through a Prism
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Refraction through a prism
normal
Air
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Refraction through a prism
normal
Air
After the 2nd refraction the emergent ray deviates downwards
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Angle of deviation
Angle of Deviation <D
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As the Refractive index μ of the material increasesthe ∠D also increases.
blue glass μ = 1.5
Red ruby μ = 1.76
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Angle of the prism (∠A)Angle between the inclined facesof the prism
Angle of deviation (∠D)Angle between the incident andthe emergent ray
∠D increases with increase in μ
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DispersionRefraction
Reflection None of these
A B
C D
Q1. In a prism light undergoes _______ atthe two slant surfaces
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DispersionRefraction
Reflection None of these
A B
C D
Q1. In a prism light undergoes _______ atthe two slant surfaces
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Emergence Prism
deviation incidence
A B
C D
Q2. The angle between two planerefracting surfaces of the prism is calledthe angle of
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Emergence Prism
deviation incidence
A B
C D
Q2. The angle between two planerefracting surfaces of the prism is calledthe angle of
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DISPERSION THROUGH A PRISM
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DISPERSION THROUGH A PRISM
Process of splitting of white light into itscomponent colours.
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Different colors refract differently
● Violet deviates the most● Red deviates the least
Red
Violet
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Wavelength (λ) Speed of light Refraction
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When light passes through the second prismthe colours combine to form White light
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Dispersion is the process ofsplitting white light into itscomponent colours.
Two prisms in opposite orientationcan negate dispersion.
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Q3. A beam of white light enters a prismand splits into rays of all its componentcolours. Three of the emergent rays areshown below. Which of the followingcould be the correct sequence of coloursfor rays A, B and C
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A-violet, B-yellow, C-red
A-orange, B-blue, C-violet
A-red, B-indigo, C-blue
A-indigo, B-orange, C-red
A B
C D
Q3. A beam of white light enters a prismand splits into rays of all its componentcolours. Three of the emergent rays areshown below. Which of the followingcould be the correct sequence of coloursfor rays A, B and C
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A-violet, B-yellow, C-red
A-orange, B-blue, C-violet
A-red, B-indigo, C-blue
A-indigo, B-orange, C-red
A B
C D
Q3. A beam of white light enters a prismand splits into rays of all its componentcolours. Three of the emergent rays areshown below.Which of the followingcould be the correct sequence of coloursfor rays A, B and C
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VelocityEnergy
amplitude phase
A B
C D
Q4. A prism splits a beam of white lightinto its constituent colours. This is sobecause ________ of different coloursis different
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VelocityEnergy
amplitude phase
A B
C D
Q4. A prism splits a beam of white lightinto its constituent colours. This is sobecause ________ of different coloursis different
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Total internal Reflection
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RAINBOW FORMATION
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3 - Step Process
Rainbow Formation
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3 - Step Process
Refraction / Dispersion
Rainbow Formation
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3 - Step Process
Refraction / Dispersion Total
Internal
Reflection
Rainbow Formation
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3 - Step Process
Refraction / Dispersion RefractionTotal
Internal
Reflection
Rainbow Formation
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Refraction, dispersion & internal reflection
Reflection, Refraction & dispersion
Dispersion, scattering & total internal reflection
Reflection, dispersion &
refraction
A B
C D
Q5. Which of the following phenomena oflight are involved in the formation of arainbow?
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Refraction, dispersion & internal reflection
Reflection, Refraction & dispersion
Dispersion, scattering & total internal reflection
Reflection, dispersion &
refraction
A B
C D
Q5. Which of the following phenomena oflight are involved in the formation of arainbow?
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The sun is in the south east
There are suspended
raindrops in the air.
The sun is in the north west Both A and C
A B
C D
Q6. John spots a rainbow in the southeastern sky. Hence
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The sun is in the south east
There are suspended
raindrops in the air.
The sun is in the north west Both A and C
A B
C D
Q6. John spots a rainbow in the southeastern sky. Hence
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ATMOSPHERIC REFRACTION
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Deviation of light as is passes through theatmosphere due to the variation in refractiveindex of air
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Stars appear raised due to atmospheric refraction
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Stars appear raised due to atmospheric refraction
Height difference
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Stars appear raised due to atmospheric refraction
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Horizon line
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Horizon line
Atmospheric refraction makes the sun appear higher than it is
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Horizon line
Difference in apparent and real position of sun is 2 minutes
2 minutes
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During sunset , we can see the sun 2 minutes after it crossed the horizon
Real
Apparent
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Early sunrise and delayed sunset
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TWINKLING OF STARS
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Varying refractive index cause twinkling of stars
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Since planets are consideredas the collection of points,their twinkling effectaverages out
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Stars onlyPlanets only.
Planets and stars Stars and satellites
A B
C D
Q7. The atmospheric refraction of lightcauses the twinkling of:
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Stars onlyPlanets only.
Planets and stars Stars and satellites
A B
C D
Q7. The atmospheric refraction of lightcauses the twinkling of:
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2 minutes6 minutes
4 minutes 8 minutes
A B
C D
Q8. Due to atmospheric refraction ofsunlight, the time from sunrise to sunsetis lengthened by about
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2 minutes6 minutes
4 minutes 8 minutes
A B
C D
Q8. Due to atmospheric refraction ofsunlight, the time from sunrise to sunsetis lengthened by about
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SCATTERING OF LIGHT
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The spreading of light is called Scattering of light.
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Scattering of light was discovered by John Tyndall. It is called Tyndall Effect
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Some colors scatter more, some less
Scattering
Wavelength
Scattering
Wavelength
Violet
Indigo
Blue
Yellow
Orange
Red
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Scattering of light in theatmosphere gives:Orange colour to the sunduring sunset and sunrise
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Scattering of light in theatmosphere gives blue colour tothe sky
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The scattering of red light is more than that of yellow light.
The scattering of red light is much less than that of yellow light.
Yellow light, when scattered is brighter
Red light, when scattered is brighter
A B
C D
Q9. Eye is more sensitive to yellow colourbut why are danger signals painted redinstead of yellow
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The scattering of red light is more than that of yellow light.
The scattering of red light is much less than that of yellow light.
Yellow light, when scattered is brighter
Red light, when scattered is brighter
A B
C D
Q9. Eye is more sensitive to yellow colourbut why are danger signals painted redinstead of yellow
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Q10. The ________ colour is at the topand the ______colour is at the bottomof the spectrum
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Coupon CODE!AKPRO
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