Podcast
Questions and Answers
What happens to light when it travels from air to water?
What happens to light when it travels from air to water?
- It slows down and bends away from the normal.
- It stays the same speed and direction.
- It slows down and bends towards the normal. (correct)
- It speeds up and bends towards the normal.
Which medium is considered rarer compared to water and glass?
Which medium is considered rarer compared to water and glass?
- Plastic
- Air (correct)
- Oil
- Wood
Why do stars appear to twinkle?
Why do stars appear to twinkle?
- Stars emit light in varying intensities.
- The density of the atmosphere changes continuously. (correct)
- The atmosphere's density is constant.
- They are moving further away from Earth.
What optical illusion occurs when viewing a pencil submerged in water?
What optical illusion occurs when viewing a pencil submerged in water?
How does atmospheric refraction affect the appearance of the sun during sunrise and sunset?
How does atmospheric refraction affect the appearance of the sun during sunrise and sunset?
In which scenario does refraction make it difficult for fishermen to see fish accurately?
In which scenario does refraction make it difficult for fishermen to see fish accurately?
What effect does wearing sunglasses without UV filters have on the eyes?
What effect does wearing sunglasses without UV filters have on the eyes?
Which of the following is NOT an example of refraction in daily life?
Which of the following is NOT an example of refraction in daily life?
Flashcards
Rarer Medium
Rarer Medium
A medium where light travels faster.
Denser Medium
Denser Medium
A medium where light travels slower.
Refraction
Refraction
The bending of light as it passes from one medium to another.
Cause of Refraction
Cause of Refraction
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Twinkling of Stars
Twinkling of Stars
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Apparent Distance
Apparent Distance
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Sunrise/ Sunset
Sunrise/ Sunset
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Pencil in Water
Pencil in Water
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Study Notes
Rarer and Denser Mediums
- A medium where wave speed is higher is called a rarer medium
- A medium where wave speed is lower is called a denser medium
- Air is a rarer medium compared to water
- Water is a denser medium compared to air
- Glass is a denser medium compared to air
- Water is a rarer medium compared to glass
Cause of Refraction
- Wave speed changes in different mediums
- When a wave moves from one medium to another, the speed changes
- This speed change causes refraction
- Light bends toward the normal when it moves from a rarer to a denser medium
- Light bends away from the normal when it moves from a denser to a rarer medium
Twinkling of Stars
- Light from stars passes through the atmosphere
- Atmosphere has hot and cold air layers with different densities
- Air currents change densities continuously
- Density changes cause the image of the star to move, resulting in the twinkling effect
Apparent Bending of a Pencil
- A pencil partially submerged in water appears bent
- Light bends when passing between air and water
- This bending is due to a change in speed as light moves between mediums
Other Examples of Refraction
- Objects appear farther away than they actually are when observed underwater (swimming pool)
- Sun appears a few minutes before and after sunrise/sunset
- Fish appear in a different location than they actually are (fishing)
- Height of people appears less when observed from across a pool or lake
- Birds dive straight to catch fish
- Printed words on paper appear elevated when a glass sheet is placed over them
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Description
Explore the concepts of refraction and the behavior of waves across different mediums in this quiz. Learn how wave speed variations affect light bending and the fascinating phenomenon of twinkling stars. Test your understanding of rarer versus denser mediums and their effects.
