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10th Class Science Light - Reflection and Refraction Image Formation by a Concave Mirror

Image Formation by a Concave Mirror

Category : 10th Class

*       Image Formation by a Concave Mirror

 

In this part we will discuss about the nature, position, and relative size of the mage formed of the various position of the objects. The image may be re a or real or virtual. We will try to find out, with the help of a mirror, the position of the objects. The nature of image formed depends on the position o the object the position carnage is obtained by intersection of at least two of the reflected rays.

 

*            When the Object is at Infinity

When the object is at infinity, in the case of a concave mirror, the image formed has the following properties:

  • The image is real.
  • The image is inverted.
  • The image is highly diminished.
  • The image is formed at the principal focus in front of the concave mirror.

 

When the Object is Infinity

 

*           When the Object is Beyond C

When the object is beyond C, the image formed has following properties:

  • The image is real.
  • The image is inverted.
  • The image is diminished to a point.
  • The image is formed between focus and centre of curvature in front of the concave mirror.

When the Object is placed beyond C

 

*            When the Object is at C

When the object is beyond C, the image formed has following properties:

  • The image is real.
  • The image is inverted.
  • The image is equal in size to that of the object.
  • The image is formed at centre of curvature in front of the concave mirror.

When the Objects is Placed at the Centre of Curvature

 

*            When the Object is between Centre of Curvature and Focus

When the object is between C and F, the image formed has following properties:

  • The image is real.
  • The image is inverted.
  • The image is enlarged in size in comparison to that of the object.
  • The image is formed beyond centre of curvature in front of the concave mirror.

When the Object is Between C and F

 

*            When the Object is at Focus

When the object is at F, the image formed has following properties:

  • The image is real.
  • The image is inverted.
  • The image is highly enlarged in size to that of the object.
  • The image is formed at infinity in front of the concave mirror.

When the Objects is at the Focus

 

*           When the Object is between Focus and Pole

When the object is between F and P, the image formed has following properties:

  • The image is virtual.
  • The image is erect.
  • The image is enlarged in size to that of the object.
  • The image is formed behind the mirror.

When the objects is between the pole and Focus

 

The summary of the above observation is given in the Table Below:

 

SL. No. Position of the Object Position of the Image Nature of Image Size of Image

1.

2.

3.

4.

5.

6.

At Infinity

Beyond C

At C

Between C and F

At F

Between F and P

At the Focus F

Between C and F

At C

Beyond C

At Infinity

Behind the Mirror

Real and Inverted

Real and Inverted

Real and Inverted

Real and Inverted

Real and Inverted

Virtual and Erect

Highly Diminished

Smaller in Size

Equal in Size

Larger in size

Highly Enlarged

Larger in Size

 



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