Question

rohan was observing the coin placed at the bottom of a glass filled with water.when he observed coin normally perpendicular to water surface, coin was almost at its actual instead of raised position . explain why this happened
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Answer 1

Given:

Rohan was observing the coin placed at the bottom of a glass filled with water.when he observed coin normally perpendicular to water surface, coin was almost at its actual instead of raised position.

To explain:

The above phenomenon.

Solution:

In the attached diagram you can easily see that the object at the base of the container appears raised when observed from an angle.

That's because the light rays originating from the object deviates away from the normal at the the water-air interface.

However , the object doesn't appear raised when it is observed perpendicularly from the top because of the following reason:

• The light rays originating from the object fall on the water air interface perpendicularly (at an angle of 0° with normal).

• This results in zero deviation and the light rays enter into the eye of the observer.

• Hence , the object appears that its real depth instead of its apparent depth.

In the attached diagram, observe the ray OAA'. This ray falls perpendicularly on the interface does not undergo any deviation and enters the eye (if the observer is on top)

$\star$ Hope It Helps.