Concave mirror

-

Concave Mirror:

If a hollow sphere is cut into parts and the outer surface of the cut part is coated with something that is very smooth. Then it becomes a mirror with its inner surface as the reflecting surface This kind of mirror is known as concave mirror. Light converges at a point when it strikes and reflects back from the reflecting surface of concave mirror. Hence, it is also known as converging mirror.  When concave mirror is placed very close to the object, a magnified and virtual image is obtained. But if we increase the distance between the object and the mirror then the size of the image reduces and a real image is formed. So the image formed by concave mirror can be small or large and it can also be real 

Concave Mirror Ray Diagram :

  • When an object the is placed at infinity, a real image is formed at the focus. The size of the image is much smaller as compared to that of the object.
Concave Mirror Ray Diagram
  • When an object is placed behind the center of curvature, a real image is formed between the center of curvature and focus. The size of the image is smaller as compared to that of the object.
Concave Mirror Ray Diagram
  • When an object is placed at the center of curvature and focus, the real image is formed at the center of curvature. The size of the image is same as compared to that of the object.
Concave Mirror Ray Diagram
  • When an object is placed in between the center of curvature and focus, the real image is formed behind the center of curvature. The size of the image is smaller as compared to that of the object.
Concave Mirror Ray Diagram
  • When an object is placed at the focus, the real image is formed at infinity. The size of the image is much larger as compared to that of the object.
Concave Mirror Ray Diagram
  • When an object is placed in between focus and pole, a virtual image is formed. The size of the image is larger as compared to that of the object.
Concave Mirror Ray Diagram
or virtual.

Comments

Post a Comment

Popular posts from this blog

-
Image
CONVEX LENS Convex lens is thicker at the centre and thinner at the edges. An optical lens is generally made up of two spherical surfaces. If those surfaces are bent outwards, the lens is called a  biconvex lens  or simply convex lens. These type of lenses can converge a beam of light coming from outside and focus it to a point on the other side. This point is known as the focus and the distance between the centre of the lens to the focus is called the  focal length of convex lens.  However, if one of the surfaces is flat and the other convex, then it is called a  plano-convex lens. Difference between convex and concave lens: There is another type of lens known as concave lens. The major differences between the two are: CONVEX CONCAVE This lens converges a straight beam of light. This lens diverges a straight beam of light. This lens is thicker at the centre and gets thinner as we move towards the edges. This lens is thinner at the centre and gets thicke
Read more

wax fire

-
A  wax fire  is created when melted or boiling  wax  is doused in water.   In the case of wax melted down, only the top surface has access to oxygen, so the fire progresses slowly. When water is added to the wax, two things happen. Firstly, the water — being denser than wax — sinks to the bottom of the container. Secondly, as burning wax quickly reaches a temperature of well over 200 degrees C, the water instantly vapourises. When water changes from a liquid to a gas, there is more than a thousand-fold increase in volume. The water expands violently, and throws the hot wax layer above it into the air as small droplets. The wax now has a much bigger surface area exposed to oxygen so combustion takes place very quickly.
Read more