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Light moves in straight lines Video Lecture - Class 7
FAQs on Light moves in straight lines Video Lecture - Class 7
| 1. How does light travel? |  |
Ans. Light travels in straight lines. It moves in a straight path until it encounters an obstacle or changes medium, where it may bend or scatter.
| 2. What is the behavior of light when it encounters an obstacle? | |
Ans. When light encounters an obstacle, it can either be absorbed, transmitted, or reflected. The behavior of light depends on the nature of the obstacle and the properties of the surface it hits.
| 3. Can light change its path? | |
Ans. Yes, light can change its path when it travels from one medium to another. This phenomenon is called refraction. When light enters a new medium, it can bend or change direction due to the change in speed.
| 4. How does light behave when it passes through different materials? | |
Ans. When light passes through different materials, it can either be transmitted or absorbed. Transparent materials allow light to pass through, while opaque materials do not allow light to pass through and absorb it. Translucent materials partially transmit light.
| 5. Why does light travel in straight lines? | |
Ans. Light travels in straight lines due to the rectilinear propagation of light. This means that light travels in a straight path until it encounters an obstacle or changes medium. It follows the shortest distance between two points, resulting in straight-line motion.
Text Transcript from Video
have you seen a ray of sunlight coming
through your window early in the morning
doesn't the beam look straight let us
see if this is true take three cardboard
pieces with a hole at the same height
mounted on stands candle and a match box
place the cardboard pieces such that the
holes are in a straight line
now light a candle and place it on one
end of the cardboard piece
now try to look at the candle through
the hole in the last cardboard can you
see it
it is only visible when the eye the
holes and the candle are in a straight
line try moving one of the cardboard
pieces to one side of the light like
this the path of light will be
interrupted and you won't be able to see
the candle so we know now that light
travels along a straight path light is a
form of energy one of the
characteristics of light is that it
travels in a straight line this is known
as the rectilinear propagation of light
through your window early in the morning
doesn't the beam look straight let us
see if this is true take three cardboard
pieces with a hole at the same height
mounted on stands candle and a match box
place the cardboard pieces such that the
holes are in a straight line
now light a candle and place it on one
end of the cardboard piece
now try to look at the candle through
the hole in the last cardboard can you
see it
it is only visible when the eye the
holes and the candle are in a straight
line try moving one of the cardboard
pieces to one side of the light like
this the path of light will be
interrupted and you won't be able to see
the candle so we know now that light
travels along a straight path light is a
form of energy one of the
characteristics of light is that it
travels in a straight line this is known
as the rectilinear propagation of light
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