Question

what happens to coin when it is kept in water for a long time​

Answer 1

$\huge\mathbb\fcolorbox{purple}{lavenderblush}{❥ศռรฬєг࿐}$

Due to the phenomenon of refraction the light reflected by the coin when enters from water to glass to air then it gets refracted saveral times due to which the the Reflected light enters to our from a distance slightly above the coin. Therefore, the coin appears to be slightly upraised.

• #нσρє íт нєℓρѕ♡~
• #мαяк αѕ вяαíηℓíѕт☘️

Answer 2

Answer:

Explanation:

When the cup is filled with water, the penny disappears. This happens because of refraction. When light bounces off of an object, it reaches our eyes and we see the object. As light travels through the sides of the glass and the water, it's refracted and never reaches our eyes, which makes the penny seems to disappear.