Understanding Refraction: The Mystery of the Immersed Pencil

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In summary, the conversation discusses the appearance of a pencil immersed in water at an angle. The pencil appears bent and larger due to refraction, but it is questioned whether it appears shorter, longer, or the same size when viewed from the opposite side. There is also confusion about the varying diagrams in different books and the concept of a virtual image appearing vertically above the object.
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nilic1
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Homework Statement



You are looking at a pencil immersed at an angle in water. The pencil appears bent and slightly larger because it appears closer. However, does it appear to be shorter, longer or the same size when viewed at an angle from the opposite side?
 
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Do you understand why it looks bent and larger?
 
  • #3
ben133 said:
Do you understand why it looks bent and larger?

I know refraction really well. Now the point is this: in 3 different books the exact same diagram is different. In one the immersed length appears longer, in the second it appears the same length and in the third it appears shorter. I was always taught that a virtual image of an immersed object always forms VERTICALLY above the object. This would make the virtual image of the immersed pencil appear shorter. Should the image of the tip of the pencil appear vertically above the real tip making the immersed part of the pencil appear shorter?
 

What happens to a pencil when it is immersed in water?

When a pencil is immersed in water, it will appear to bend or break due to the refraction of light. This is because light travels at different speeds through air and water, causing the pencil to look distorted.

Why does a pencil appear to bend when it is placed in water?

The bending of the pencil is an optical illusion caused by the refraction of light. When light passes from one medium (air) to another (water), it changes speed and direction, making the pencil appear bent.

Does the pencil actually bend or break when placed in water?

No, the pencil does not physically bend or break when placed in water. It only appears to do so due to the refraction of light. The pencil remains intact and will return to its original shape when removed from water.

What factors affect the amount of bending in a pencil when placed in water?

The amount of bending in a pencil depends on the angle at which it is placed in water, the shape and size of the pencil, and the refractive index of the water. The greater the angle of immersion and the higher the refractive index, the more the pencil will appear to bend.

Can other objects besides a pencil appear to bend when placed in water?

Yes, any object that is placed in water can appear to bend due to the refraction of light. This effect is not limited to pencils and can be seen with any object that is partially submerged in water.

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