amrit sir is confused today!!!

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

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