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प्रश्न
We can see the sun even when it is little below the horizon because of ______.
विकल्प
Reflection of light
Refraction of light
Dispersion of light
Absorption of light
उत्तर
We can see the Sun even when it is little below the horizon because of refraction of light.
Explanation:
We can see the Sun even when it is a little below the horizon because of atmospheric refraction. The Earth’s atmosphere bends the light from the Sun upwards towards the eye of the observer. Even though the Sun itself might be just below the horizon line, the light is refracted or bent by the atmosphere, thus making the Sun appear to be visible.
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संबंधित प्रश्न
Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, if appears in the mirror that we are writing with the left hand.
If an object is placed at a distance of 10 cm in from of a plane mirror, how far would it be from its image?
Which property of light makes a pencil cast a shadow when it is held in front of a light source?
The letter F is placed in front of a plane mirror:
How would its image look like when seen in a plane mirror?
What is the difference between regular reflection of light and diffuse reflection of light?
The image in a plane mirror is virtual and laterally inverted. What does this statement mean?
The angle of reflection is equal to the angle of incidence:
(a) always
(b) sometimes
(c) under special conditions
(d) never
The figure given alongside shows the image of a clock as seen a plane mirror. The correct time is:
Figure
(a) 2.25
(b) 2.35
(c) 6.45
(d) 9.25
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.
Why does a ray of light bend when it travels from one medium to another?
Fill in the following blank with suitable word:
Light travelling along a normal is ...............refracted.
When a light ray passes from air into glass, what happens to its speed? Draw a diagram to show which way the ray of light bends.
Show the lateral displacement of the ray on the diagram.
Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. State whether the bending of pencil will increase or decrease if water is replaced by another liquid which is optically more dense than water. Give reason for your answer.
Light travelling from a denser medium to a rarer medium along a normal to the boundary:
(a) is refracted towards the normal
(b) is refracted away from the normal
(c) goes along the boundary
(d) is not refracted
A vertical ray of light strikes the horizontal surface of some water:
What is the angle of incidence?
A vertical ray of light strikes the horizontal surface of some water:
What is the angle of refraction?
How does the light have to enter the glass:
to produce a large amount of bending?
How does the light have to enter the glass:
for no refraction to happen?
The depth of a pond when seen from above appears to be less.
When a ray of light travels from water to air, it bends ............. the normal.
When a ray of light travels from air to glass, it bends .......... the normal.
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.
What is atmospheric reflection? Explain with the help of a labelled diagram that the position of a star as seen by us is not its true position.
List four characteristics of the image formed by a concave lens of focal length 20 cm when the object is placed at a distance of 40 cm from its optical centre.
The phenomenon of change in the direction of light when it passes from one transparent medium to another is called ___________.
The speed of light varies in different media.
Write scientific reason.
The sun appears on the western horizon for some time after sunset.
Write scientific reason.
The bottom of a pond appears raised.
Why does a ray of light bend when it travels from one medium to another?
The refractive index of a transparent medium is always greater than ______.
Assertion and reasoning type
- Assertion: If the refractive index of the medium is high (denser medium) the velocity of the light in that medium will be small
- Reason: Refractive index of the medium is inversely proportional to the velocity of the light
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?
The bending of light as it passes from one medium to another is called ______.
Light is refracted or bent while going from one medium to another because of its ______ changes.
A star appears twinkling into the sky because of the reflection of light by the atmosphere.
Twinkling of stars and Mirage are the two phenomena occurring due to refraction.
The bottom of swimming pool appears to be less deep than the actual one because of
