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प्रश्न
In which material do you think light rays travel faster-glass or air?
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उत्तर
The speed of light in an optically rarer medium is more than the speed of light in a denser medium. Now, air is an optically rarer medium and glass is a denser medium. Therefore, light rays will travel fast in air.
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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.
The letter F is placed in front of a plane mirror:
How would its image look like when seen in a plane mirror?
State and explain the laws of reflection of light at a plane surface (like a plane mirror), With the help of a labelled ray-diagram. Mark the angles of 'incidence' and 'reflection' clearly on the diagram. If the angle of reflection is 47.5°, what will be the angle of incidence?
A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is ______.
With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is.
State two factors on which the lateral displacement of the emergent ray depends.
A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:
(a) 0°
(b) 45°
(c) 90°
(d) 120°
When a ray of light travels from water to air, it bends ............. the normal.
What do you understand by refraction of light?
Lights of different colours are used as signal for safety transport. From these, the wavelength of red light is _______ nm.
State whether true or false. If false, correct the statement.
The angle of deviation depends on the refractive index of the glass.
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.
The refractive index of a transparent medium is always greater than ______.
The angle of incidence for a ray of light having zero reflection angle is ______.
Which surface will not reflect most of the light falling on them?
When light passes from one medium to another the ray gets bent. This property of light is called ______.
Light bends as it passes from one medium to another. What is this phenomenon called?
A star appears twinkling into the sky because of the reflection of light by the atmosphere.
When a ray of light travels normal to the given surface, then the angle of refraction is ______.
