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प्रश्न
State two effects caused by the refraction of light.
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उत्तर
Refraction of light can cause following two effects:
1. An object placed under water appears to be raised.
2. A stick held obliquely and partly immersed in water appears to be bent at the water surface.
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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.
Fill in the following blank with a suitable word:
When light is reflected, the angles of incidence and reflection are ............ .
A wall reflects light and a mirror also reflects light. What difference is three in the way they reflect light?
State the uses of plane mirrors.
What is meant by 'reflection of light'?
Write all the capital letters of the alphabet which look the same in a plane mirror.
Why does a ray of light bend when it travels from one medium to another?
Fill in the following blank with suitable word:
Light bends when is passes from water into air. We say that it is ............
A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.
Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.
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.
How does the light have to enter the glass:
for no refraction to happen?
Water is optically .......... than air.
Write scientific reason.
The bottom of a pond appears raised.
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
What is refractive index?
Why a pencil partly immersed in water appears to be bent at the water surface.
How do twinkling stars occur? (or) what is the cause of the twinkling of stars?
A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show. the refraction of light in this case.
