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प्रश्न
Write scientific reason.
The sun appears on the western horizon for some time after sunset.
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उत्तर
- As ray of light from the Sun enters the earth’s atmosphere, it follows a curved path due to refraction, before reaching the observer.
- This makes the apparent position of the Sun slightly higher than the actual position for the observer.
- Hence, due to the atmospheric refraction of sunlight, the observer on the earth continues to see the setting Sun for two minutes after the Sun has dipped below the horizon, thus delaying the sunset.
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संबंधित प्रश्न
What is refraction of light?
Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.
What is lateral inversion? Explain by giving a suitable example.
Which type of reflection of light leads to the formation of images?
State the uses of plane mirrors.
Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram:
- Incident ray
- Point of incidence
- Normal
- Reflected ray
- Angle of incidence
- Angle of reflection
Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper.
The image in a plane mirror is virtual and laterally inverted. What does this statement mean?
Explain how to read the following message which was found on some blotting paper:
If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it?
State two effects caused by the refraction of light.
When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?
A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it?
As light rays pass from water into glass, are they refracted towards the normal or away from the normal?
Which phenomenon of light makes the water to appear shallower than it really is?
Fill in the following blank with suitable word:
Light bends when is passes from water into air. We say that it is ............
What is meant by ‘refraction of light’?
Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.
- With the help of a diagram, show how when light falls obliquely on the side of a rectangular glass slab, the emergent ray is parallel to the incident ray.
- Show the lateral displacement of the ray on the diagram.
The speed of light is more in glass than in water.
Draw suitable diagrams to illustrate how a beam of light incident parallel to the principal axis is reflected by:
(a) a concave mirror, and (b) a convex mirror
What is the cause of refraction of light when it passes from one medium to another?
A ray of light passes from medium 1 to medium 2. Which of the following quantities of the refracted ray will differ from that of the incident ray: Speed, intensity, frequency, wavelength?
Fill in the blank and Explain the completed sentences.
The change in ______ of light rays while going from one medium to another is called refraction.
Explain how the formation of a rainbow occurs.
The laws of reflection hold true for ______.
Due to _______ pencil looks bent in water, in the given experiment.
Identify the wrong figure from the following.
Write scientific reason.
The bottom of a pond appears raised.
State whether true or false. If false, correct the statement.
The angle of deviation depends on the refractive index of the glass.
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?
Which object use the reflection of light?
Light is refracted or bent while going from one medium to another because of its ______ changes.
Mirage is an example of refraction and the total internal reflection of light.
The bottom of swimming pool appears to be less deep than the actual one because of
The change in the direction of the path of light when it passes from one transparent medium to another transparent medium is called:
The ray that enters the second medium after crossing the boundary is called the:
When light passes from one transparent medium to another, its direction changes due to:
When a light ray passes from a rarer medium to a denser medium, it bends:
