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Amrit Sir is confused today!!!
Because he realised ki “Sab Moh Maya Hai”
Stars twinkle and Planets doesn’t
Early sunrise & delayed sunset
Bridge course1
Chapter Outline2
Regular Umang Sessions3
One shot4
Menti Quiz and doubt solving5
Refraction through a prism1
Dispersion through a prism2
TIR & Rainbow formation3
Atmospheric refraction & its applications4
Th
e C
olo
rfu
l Wo
rld
Scattering of light5
Refraction through a prism1
Dispersion through a prism2
TIR & Rainbow formation3
Atmospheric refraction & its applications4
Th
e C
olo
rfu
l Wo
rld
Scattering of light5
Q5: Name 3 phenomena that cause theformation of rainbow?
ANSWER: Dispersion, TIR &Refraction
Q1: When a rainbow is formed the sun is
Behind you In front of you
Directly overhead To the side of you
A B
C D
Q1: When a rainbow is formed the sun is
Behind you In front of you
Directly overhead To the side of you
A B
C D
Q2: When sunlight bounces off of the inside ofa raindrop, it is an example of
Refraction Diffraction
Dispersion Total internal reflection
A B
C D
Q2: When sunlight bounces off of the inside ofa raindrop, it is an example of
Refraction Diffraction
Dispersion Total internal reflection
A B
C D
Q3: When the angle of refraction is 90o, theangle of incidence is called
Angle of Prism Angle of deviation
Critical angle None of these
A B
C D
Q3: When the angle of refraction is 90o, theangle of incidence is called
Angle of Prism Angle of deviation
Critical angle None of these
A B
C D
We have seen the refraction of light through a prism
Occurs in
How refraction
Atmosphere
Early Sunrise & Delayed Sunset
Atmospheric refraction makes the sun appear higher than it is
Difference between actual & apparent position is 2 minutes.
2 minutes
Sunrises 2 minutes earlier than it actually crosses the horizon
Sunrises 2 minutes earlier than it actually crosses the horizon
Similarly during sunset , we can see the sun after it crossed the horizon
Sunrises 2 minutes earlier than it actually crosses the horizon
Similarly during sunset , we can see the sun after it crossed the horizon
As a result sunrise advances & sunsetdelays by 2 minutes
Let’s see why stars twinkle?
How light from a star reach earth?
Since the refractive index changes sometimes morelight reaches him and sometimes less light
Since the refractive index changes sometimes morelight reaches him and sometimes less light
Intensity of star keeps on changings causing twinkling of stars
Why planets don't twinkle?
Star is a point source, planet is a collection of bodies
Star is a point source, planet is a collection of bodies
Star Planet
V I PVery Important Problems
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V I PVery Important Problems
Q1: Refraction of light by the earth’satmosphere due to variation in air density iscalled
Atmospheric reflection
Atmospheric refraction
Atmospheric dispersion Both (ii) & (iii)
A B
C D
Q1: Refraction of light by the earth’satmosphere due to variation in air density iscalled
Atmospheric reflection
Atmospheric refraction
Atmospheric dispersion Both (ii) & (iii)
A B
C D
Q2: We can see the sun before the actualsunrise about
2 mins 20 minutes
5 minutes 4 mins
A B
C D
Q2: We can see the sun before the actualsunrise about
2 mins 20 minutes
5 minutes 4 mins
A B
C D
Q3: The stars twinkle but the planets do nottwinkle at night because
The stars are small but the planets are large
The stars are large but the planets are small
The stars are much nearer but the planets
are far away
The stars are far away but the planets are
much nearer
A B
C D
Q3: The stars twinkle but the planets do nottwinkle at night because
The stars are small but the planets are large
The stars are large but the planets are small
The stars are much nearer but the planets
are far away
The stars are far away but the planets are
much nearer
A B
C D
Q4: As light from a far off star comes downtowards the earth
it bends away from the normal
it bends towards the normal
it does not bend it is reflected back
A B
C D
Q4: As light from a far off star comes downtowards the earth
it bends away from the normal
it bends towards the normal
it does not bend it is reflected back
A B
C D
Q5: All celestial bodies appear _______ thenthey are because of atmospheric refraction.
AKPRO
