What is condition for no refraction?
If the refractive indices are same in both medias then there will be no refraction and light will pass without any refraction. And when the incident ray is striking perpendicular to one media to another the light will pass without any refraction.
What are the two requirements for refraction?
Conditions of Refraction
- The students must change speed when crossing the boundary.
- The students must approach the boundary at an angle; refraction will not occur when they approach the boundary head-on (i.e., heading perpendicular to it).
Where is refraction used in real life?
Refraction of light can be seen in many places in our everyday life. It makes objects under a water surface appear closer than they really are. It is what optical lenses are based on, allowing for instruments such as glasses, cameras, binoculars, microscopes, and the human eye.
What is real life example of reflection and refraction?
Display different types of objects that reflect and refract. Common objects include mirrors (reflect); glass of water with spoon in it (refract); foil (reflect); oil in a glass bottle (refract); prism (refract); glass (refract); lens (refract); or any shiny surface (reflect).
What are the three things required to observe a shadow?
The following three things are required for a shadow to form:
- a source of light.
- an opaque object.
- a screen or surface behind the object.
What are the four characteristics of shadow?
Characteristics of a shadow :
- It depends on shape of the object.
- It depends on source of light whether it is plane parallel rays or spherical.
- It depends on position of the object whether the object is at infinite or finite distance.
- It depends on the position of source of light.
Why do we need order to see a shadow?
Opaque objects are those which do not let the light pass through them. Opaques objects can form a shadow in the presence of light. Opaque objects do not allow the light to pass through them. So, Opaque objects and a light source are the main requirements to see a shadow.
What is difference between shadow and image?
Images have colour, unlike shadows. They are formed due to the converging rays of light that comes after reflecting from objects. A shadow is formed when an opaque object comes in the path of light.
What information do we get from shadows?
Answer: Shadows give us some information about shapes of objects. Sometimes, shodows can also mislead us about the shape of an object. Yes, we can think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way.
Does the direction of shadow change during the day?
Changing shapes and sizes These changes are caused by the position of the light source. When we are outside on a sunny day, we can see how our shadows change throughout the day. The Sun’s position in the sky affects the length of the shadow. When the Sun is low on the horizon, the shadows are long.