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Standard XII
Physics
Lens Maker's Formula
Rakesh did an...
Question

Rakesh did an experiment in which he kept his pencil inside a glass of water. He observed that the pencil bent along its length inside the water. He repeated the experiment by changing the medium to oil and glycerine and noticed the same observation but the amount of bending was different in each case.

Which of the following phenomena is similar to the above experiment?

A
Blue colour of sky.
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B
Visible path of light in a dark room.
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C
Early sunrise and delayed sunset.
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D
Red colour of sky during sunrise and sunset.
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Solution

The correct option is C Early sunrise and delayed sunset.
Early sunrise and delayed sunset happens due to atmospheric refraction. When sun is at horizon, the light coming from the sun continuosly bends due to atmospheric refraction, due to which the apparent position of sun appears slightly above the horizon.


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Q. Rakesh did an experiment in which he kept his pencil inside a glass of water. He observed that the pencil bent along its length inside the water. He repeated the experiment by changing the medium to oil and glycerine and noticed the same observation but the amount of bending was different in each case.

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Q. Rakesh did an experiment in which he kept his pencil inside a glass of water. He observed that the pencil bent along its length inside the water. He repeated the experiment by changing the medium to oil and glycerine and noticed the same observation but the amount of bending was different in each case.

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Q. Rakesh did an experiment in which he kept his pencil inside a glass of water. He observed that the pencil bent along its length inside the water. He repeated the experiment by changing the medium to oil and glycerine and noticed the same observation but the amount of bending was different in each case.

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Q. Case: Pooja did an experiment with an equilateral glass prism in which she projected a narrow beam of white light source from one side of the surface of the prism and placed a screen on the other side of the prism. She observed certain patches of different colours on the screen. Later, she repeated the same experiment with a red-light source, however, she could only observe a red coloured patch on the screen. Again, she repeated the experiment with blue and green light sources, respectively, and could only see one colour patch on both the occasions.

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