A lemon in a glass of water appear bigger than its actual size is due to refraction of light". Reason: Light is refracted as it passes from water into air. And the refracted ray bends away from normal.

Reason for the Lemon Appearing Larger in Water

Refraction of Light: The main reason behind the lemon appearing larger in size when kept in water is due to the phenomenon of refraction of light.

Definition of Refraction: Refraction is the bending of light waves as they pass through a medium of different density.

Light Travelling Through Air and Water: Light travels at different speeds through different mediums. It travels faster through air than through water. When light travels from a less dense medium (air) to a denser medium (water), it bends towards the normal.

Bending of Light Waves: When light waves enter the water, they bend towards the normal, and when they exit the water, they bend away from the normal. This bending of light waves causes the image of the lemon to appear larger than its actual size when seen through the water.

Change in Angle and Direction of Light: Due to the change in angle and direction of light waves, the image of the lemon appears to be closer to the surface of the water than it actually is. This creates the illusion that the lemon is larger in size than its actual size.

Conclusion: In conclusion, the lemon appears larger in size when kept in water due to the phenomenon of refraction of light. The bending of light waves as they pass through water causes the image of the lemon to appear closer and larger than it actually is. This is a simple and fascinating example of the principles of physics at work in our everyday lives.