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प्रश्न
Due to _______ pencil looks bent in water, in the given experiment.
विकल्प
refraction of light
dispersion of light
internal reflection of light
reflection of light
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उत्तर
Due to refraction of light pencil looks bent in water, in the given experiment.
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संबंधित प्रश्न
State whether the following statement is true of false:
A student says that we can see an object because light from our eyes is reflected back by the object.
What type of reflection of light takes place from a cinema screen?
An extended object in the form of an arrow pointing upward has been placed in front of a plane mirror. Draw a labelled ray-diagram to show the formation of its image.
State the uses of plane mirrors.
The image in a plane mirror is virtual and laterally inverted. What does this statement mean?
An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the positions of the original and final images seen in the mirror is ______.
Explain how to read the following message which was found on some blotting paper:
A ray of light travelling in glass emerges into air. State whether it will bend towards the normal or away from the normal.
Which phenomenon of light makes the water to appear shallower than it really is?
Why does a ray of light bend when it travels from one medium to another?
Light travels more quickly through water than through glass.
- Which is optically denser: water or glass?
- If a ray of light passes from glass into water, which way will it bend: towards the normal or away from the normal?
State two factors on which the lateral displacement of the emergent ray depends.
A ray of light when passes from glass to air, bends towards the normal.
When a ray of light travels from water to air, it bends ............. the normal.
The diagram (figure) given below shows two parallel rays 1 and 2 incident on (a) a concave mirror, (b) a convex mirror. Draw the reflected rays and mark the focus by the symbol F.
What is the cause of refraction of light when it passes from one medium to another?
A ray of light A incident from air suffers partial reflection and refraction at the boundary of water.
- Complete the diagram showing (i) the reflected ray B and (ii) the refracted ray C.
- How are the angles of incidence i and refraction r related?
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.
The phenomenon of change in the direction of light when it passes from one transparent medium to another is called ___________.
Write scientific reason.
The sun appears on the western horizon for some time after sunset.
Write scientific reason.
A pencil appears to be broken near the surface of water.
Observe the given figure and write appropriate phenomenon of light in the box.
Explain with diagrams how refraction of incident light takes place from
- rarer to denser medium
- denser to rarer medium
- normal to the surface separating the two media.
Numerical problems.
The speed of light in water is 2.25 × 108 ms–1. If the speed of light in vacuum is 3 × 108 ms–1, calculate the refractive index of water.
The refractive index of four substances A, B, C, and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
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 phenomenon of light passing through the object is called ______.
When light passes from one medium to another the ray gets bent. This property of light is called ______.
Twinkling of stars and Mirage are the two phenomena occurring due to refraction.
Match the following:
| Column I | Column II | ||
| 1. | r > 90 | a. | Light gazes at the surface of separation between the two modes. |
| 2. | r = 90 | b. | No refraction. |
| 3. | r < 90 | c. | Refracted ray away from the normal |
In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.
When a ray of light travels normal to the given surface, then the angle of refraction is ______.
The ray that enters the second medium after crossing the boundary is called the:
The absolute refractive index of a medium is given by:
