Question

state two phenomena which suggest rectilinear propagation of light

Answer 1

Two natural phenomena that occur due to the characteristic of light travelling in a straight line are : A lunar eclipse that occurs when the Earth is situated between the Moon and the Sun. The shadow of the Earth falls on the surface of the Moon to appear invisible

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Answer 2

Lights travel in a straight line is called rectilinear propagation light. Rectilinear propagation of light is responsible for the forming of shadows that means light cannot travel around an object.

Explanation:

Rectilinear propagation of light:

• The rectilinear propagation of light refers to the tendency of light to travel in a straight line without any interference in the path.

• When light travels through a medium, say air or water, it follows a straight line.  

• However, the path changes only if there is a change in the medium.

Example of rectilinear propagation of light:

• A pinhole camera
• Eclipse
• Forming of shadows and
• Shorter hands under the water.

Let's see how any two of these happen.

Eclipse:

• An eclipse occurs when an earth-like celestial body emerges from the sun in the path of light reaching the moon.  

• During a lunar eclipse, we can see the shadow of our planet on the moon.  
• However, this will only happen as long as it stays in the path of sunlight.  

Shorter Hands Underwater:

• When you put your hand underwater, you will notice that it is shorter and closer.  

• This is because the light reflected by your hand travels in a straight line underwater, but changes its original course when in the air.  

• Because air and water have different densities, light travels at different speeds.  
• This phenomenon shows your hand shorter and closer.