# What happen when light goes from rarer medium to denser medium?

## What happen when light goes from rarer medium to denser medium?

You saw that light bends toward the normal in this situation, and that the angle in the denser medium will be smaller than the angle in the rarer medium. When light travels from a denser medium to a rarer medium, it bends away from the normal, as illustrated to the left. This behavior follows from Snell’s Law.

## Does light really travel in a straight line?

Any physics student knows that light travels in a straight line. But now researchers have shown that light can also travel in a curve, without any external influence. Out in space, light rays passing near very massive objects such as stars are seen to travel in curves.

## Who was the first to calculate the most accurate speed of light?

astronomer Ole Roemer

## How will you prove that light travel in a straight line?

Two experiments are used to demonstrate how light travels in straight lines. In the first example, the presenter arranges three pieces of card, with holes in, in an uneven line. The light stops and cannot travel through all three cards. When she arranges the holes in a straight line, the light can travel through.

## Why do light travel in a straight line?

Light travels in straight lines primarily due to the fact that light is a wave. However, light can change its path (away from a straight line) when it is incident on certain obstacles. This effect is commonly reffered to as diffraction.

## What is it called when light travels in a straight line?

In all of these cases, light is modeled as traveling in straight lines called rays. The word ray comes from mathematics and here means a straight line that originates at some point. It is acceptable to visualize light rays as laser rays (or even science fiction depictions of ray guns).

## How does light travel in a straight line path explain with simple experiment?

You can pass a knitting needle through the holes to confirm if they are in a straight line. Now place a burning candle in front of the board C and look through the pinhole in board A. The flame will be clearly visible. This shows that light travels in a straight line.

## What does the experiment prove to you about the path of light travel?

This experiment shows that light travels in a straight line in the air. But it also bounces off of a reflective surface, like a mirror. The angle of the light as it bounces off the mirror will be the same as the angle of the light as it hits the mirror.

## Does light travel in straight line describe an experiment in support of your answers?

Describe an experiment to support your answer. Answer: Yes light does travel in straight lines. To observe whether light travels in straight line or not, take 3-4 thin cardboard pieces.

## How does light travel from a source?

Light waves travel out from their source in straight lines called rays. Rays do not curve around corners, so when they hit an opaque object (one that does not allow light to pass through it), they are blocked from reaching the other side of that object.

## Why does light not need a medium to travel through?

We know that light doesn’t need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels. Light contrasts with sound, which travels through the air (or some other material medium).

## What medium does light travel fastest through?

Light waves do not need a medium in which to travel but sound waves do. Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.

## Why does light have energy but no mass?

Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum. But an object with zero energy and zero mass is nothing at all. Therefore, if an object with no mass is to physically exist, it can never be at rest. Such is the case with light.

## Why does light turn into heat?

“Light from the sun excites electrons in the atoms which constitute the brick wall. We feel that motion as “heat.” The atoms which make the jump to vibrational excitation soon collide into neighboring atoms, dissipating their vibrational energy throughout the entire brick, making the brick hot throughout.

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