rrb-ntpc · rrb-ntpc let’s crack it. general science. refraction of light प्रकाश...
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RRB-NTPCLet’s crack it.
GENERALSCIENCE
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REFRACTION OF LIGHTप्रकाश का अपवर्तन
Lecture By
NEERAJ SIR
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BOOST YOUR PREPRATION
SCIENCE LIVE TEST – 4 PM
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SSC JE MECHANICAL COMPLETE COURSE
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REFRACTION OF LIGHTप्रकाश का अपवर्तन
Lecture By
NEERAJ SIR
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Refraction of light
• When light travelsfrom one mediuminto another mediumit gets bent. Thisbending of light iscalled refraction oflight. जब प्रकाश एकमाध्यम से दसूरे माध्यममें जाता है तो वह अपनेपथ से ववचलित होजाता है। प्रकाश के इसववचिन को प्रकाश काअपवततन कहा जाता है
Medium 1 माध्यम 1
Medium 2 माध्यम 2
Incident ray आपततत ककरण
Refracted ray अपवतततत ककरण
Normal अलििंिIncident angle आपतन कोण
Refracted angle अपवततन कोण
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Medium
• Medium are classified as :
• माध्यम को वर्गीकृत ककया र्गया है :
Medium
Denser Medium सघन माध्यम
Rarer Medium ववरल माध्यम
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Medium
Denser Medium सघन माध्यम
• If optical density is high, speed of light inthe medium will be low. यदद प्रकाशीय घनत्वअधिक है, तो माध्यम में प्रकाश की र्गतत कमहोर्गी।
Rarer Medium ववरल माध्यम
• If optical density is low, speed of light in themedium will be high. यदद प्रकाशीय घनत्वकम है, तो माध्यम में प्रकाश की र्गतत अधिकहोर्गी।
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Medium
• When light travels from a rarer medium to adenser medium, it bends towards thenormal. जब प्रकाश एक ववरि माध्यम से एकसघन माध्यम तक जाता है, तो यह अलिििंकी ओर झुकता है।
ववरि माध्यम
सघन माध्यम
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Medium
• When light travels from a denser mediumto a rarer medium, it bends away from thenormal. जब प्रकाश एक सघन माध्यम से एकववरि माध्यम तक जाता है, तो यह अलििंि सेदरू हट जाता है।
ववरि माध्यम
सघन माध्यम
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Refractive index
• The refractive index of a mediumdescribes how fast light travels throughthe medium. ककसी माध्यम का अपवततनांकबताता है कक माध्यम में प्रकाश ककतनी तेजर्गततमान होता है।
• It is proportional to optical density andinversely proportional to speed of light inthe medium. यह प्रकाशीय घनत्व के लिएसमानुपाततक होता है और माध्यम में प्रकाश कीर्गतत के व्युत्रमानुपाततक होता है।
𝝁 ∝𝟏
𝒗
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Refractive index
• The refractive index of a medium is theratio of the speed of light in air or vacuumto the speed of light in medium. ककसीमाध्यम का तनरपेक्ष अपवततनांक, वायु मेंप्रकाश की र्गतत या तनवातत में प्रकाश की र्गततऔर माध्यम में प्रकाश की र्गतत का अनुपातहोता है।
𝝁𝒎 =𝒄
𝒗
Substance Speed of light (ms–1) Refractive Index (μ)
Water 2.25×108 1.33
Glass 2×108 1.5
Diamond 1.25×108 2.41
Air 3×108 1.00
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Refractive index
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Laws of Refraction of Light
• The incident ray, the refracted ray andthe normal to the surface all lie in thesame plane.
• आपततत ककरण, अपवतततत ककरण और सतहपर अलििंि सिी एक ही समति में स्थथतहोते हैं।
1 Medium 1 माध्यम 1
Medium 2 माध्यम 2
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Medium 1 माध्यम 1
Medium 2 माध्यम 2
Laws of Refraction of Light
• For pair of two mediums snell’s lawwritten as.
2. Snell’s Law
𝝁𝟏 sin 𝒊 = 𝝁𝟐 sin 𝑟
i
rsin 𝒊
sin 𝒓=𝝁𝟐𝝁𝟏
=
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