गायब होता बीकर (अपवर्तनांक मिलान)

एक मिलान अपवर्तनांक वाले तरल में डुबोकर एक कांच की वस्तु को अदृश्य बनाना

Classroom Demonstrations Beginner (Middle School) 15 मिनट ~$8.00

उद्देश्य

एक कांच की वस्तु को उसके अपवर्तनांक से मेल खाने वाले तरल में डुबोकर अदृश्य बनाकर अपवर्तनांक की अवधारणा प्रदर्शित करें।

पृष्ठभूमि

We see transparent objects like glass because light bends (refracts) at the surface where the glass meets air. The degree of bending depends on the difference in refractive index between the two media. If a glass object is placed in a liquid with the same refractive index, light passes through without bending, and the object becomes effectively invisible. Pyrex glass (n ≈ 1.474) nearly matches vegetable oil (n ≈ 1.47), creating a stunning visual effect.

सुरक्षा चेतावनियाँ

  • Vegetable oil is slippery — clean up spills immediately to prevent falls
  • Glass objects can break — handle with care

आवश्यक PPE

goggles

सामग्री

  • Vegetable oil (or glycerol) (500 mL)
    Refractive index ≈ 1.47
  • Pyrex glass beaker or rod (1)
    To disappear
  • Regular glass rod (1)
    For comparison (different n)

उपकरण

Large glass beaker (1 L) or clear container

प्रक्रिया

1

Fill the large beaker about 2/3 full with vegetable oil.

2 मिनट
2

Show the Pyrex glass object to the audience. Note that it is clearly visible in air.

1 मिनट
3

Slowly lower the Pyrex glass into the vegetable oil. As it submerges, it gradually becomes invisible.

3 मिनट Lower gently to avoid splashing
4

For comparison, lower the regular glass rod into the same oil. It remains visible because its refractive index does not match.

3 मिनट
5

Discuss: light refracts at boundaries between materials with different refractive indices. When n values match, no refraction occurs and the object seems to disappear.

6 मिनट

अपेक्षित परिणाम

The Pyrex glass becomes nearly invisible when submerged in vegetable oil. Only slight distortions at the edges may be visible. The regular glass rod remains clearly visible in the same oil.

सफाई

Remove glass objects and wash with dish soap. Oil can be saved for reuse or disposed of in general waste. Wipe up any oil spills.

विवरण

श्रेणी
Classroom Demonstrations
कठिनाई
Beginner (Middle School)
अवधि
15 मिनट
अनुमानित लागत
$8.00
चरण
5
सामग्री
3

अधिक प्रयोग

आयोडीन घड़ी अभिक्रिया 45 min गैर-न्यूटोनियन तरल: ऊब्लेक 20 min घनत्व स्तंभ इंद्रधनुष 30 min तात्कालिक ठंड: अतिशीतित जल 120 min थर्माइट अभिक्रिया 30 min दोलनशील ब्रिग्स-राउशर अभिक्रिया 40 min ल्यूमिनॉल के साथ केमिल्यूमिनेसेंस 30 min सूखी बर्फ में मैग्नीशियम जलाना 25 min सोडियम और पानी की अभिक्रिया 25 min हाथी टूथपेस्ट 20 min

Frequently Asked Questions

What is the objective of गायब होता बीकर (अपवर्तनांक मिलान)?
एक कांच की वस्तु को उसके अपवर्तनांक से मेल खाने वाले तरल में डुबोकर अदृश्य बनाकर अपवर्तनांक की अवधारणा प्रदर्शित करें।
How difficult is गायब होता बीकर (अपवर्तनांक मिलान)?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for गायब होता बीकर (अपवर्तनांक मिलान)?
Key safety precautions include: Vegetable oil is slippery — clean up spills immediately to prevent falls; Glass objects can break — handle with care.
What materials are needed for गायब होता बीकर (अपवर्तनांक मिलान)?
The main materials required are: Vegetable oil (or glycerol), Pyrex glass beaker or rod, Regular glass rod.
What results should I expect from गायब होता बीकर (अपवर्तनांक मिलान)?
The Pyrex glass becomes nearly invisible when submerged in vegetable oil. Only slight distortions at the edges may be visible. The regular glass rod remains clearly visible in the same oil.