When the object is placed between the pole and the focus of the concave mirror

Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.

Ray diagram showing the formation of an image by a concave mirror for an object placed between its pole and focus:

When the object is placed between focus F and pole P, the image is formed behind the mirror.

The image so formed is virtual, upright and magnified.

Concept: Spherical Mirrors

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Page 2

Draw a ray diagram to show the formation of image by a concave mirror for the object beyond its centre of curvature. State three characteristics of the image.

Ray diagram showing the formation of an image by a concave mirror for the object beyond its centre of curvature:

When the object is placed beyond the centre of curvature C, the image is formed between focus F and centre of curvature C. The image so formed is real, inverted and diminished.

Concept: Spherical Mirrors

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Option 3 : Behind the mirror

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CONCEPT:

Concave mirror: The mirror in which the rays converge after falling on it is known as the concave mirror.
- A concave mirror is also known as a converging mirror.
- The focal length of a concave mirror is negative according to the sign convention.
All the position of object and images for the concave mirror are given in the below table:

Position of the object	Position of the image	Size of the image	Nature of the image
At infinity	At focus, F	Diminished and pointed in size	Inverted and real
Beyond C	Between F and C	Diminished	Inverted and real
At C	At C	Same size	Inverted and real
Between F and C	Beyond C	enlarged	Inverted and real
At focus, F	At infinity	enlarged	Inverted and real
Between F and Pole	Behind the mirror	enlarged	Erected and virtual

corresponding image of the table:

EXPLANATION:

From the above table if the object is between the focus and pole of the mirror then the position of the image obtained will be behind the mirror (virtual image).
So the correct answer is option 3.

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Hint: Using the knowledge of rules of ray diagrams and laws of reflection, we can find out the mirror image of the object placed between the focus and pole of the concave mirror by drawing a ray diagram. The mirror image will tell us the nature of the image and its size.

Complete step by step answer:

Mirrors with curved reflecting surfaces are called spherical mirrors, they are of two types- concave mirror and convex mirror. Concave mirrors are also known as converging mirrors as they converge/focus the light at one point. These mirrors have a reflecting surface recessed inwards and the outer side is polished.

Rules to obtain the image by a ray diagram:- Ray parallel to the principal axis will pass through the focus after reflection.- Ray passing through focus will become parallel to the principal axis after reflection.- Ray passing through the center of curvature will follow the same path back after reflection.- The Ray incident at the pole is reflected making the same angle with the principal axis.

These rules are formed based on the laws of reflection that are as follows:

- The incident ray, the reflected ray and the normal (at the point of incidence) all lie in the same plane.- The angle of reflection (r) is always equal to the angle of incidence (i).Now considering the rules mentioned above we will draw the ray diagram of the object placed between the focus and pole of the concave mirror:

Thus, we observe that the image formed is virtual, erect and enlarged.

So, the correct answer is “Option D”.

Additional Information:

A Convex mirror is another type of spherical mirror, in these mirrors reflecting surface bulges out towards the light source. They are also called diverging mirrors as they diverge the light away.

Note:

A Concave mirror forms a real and inverted image at all the points except the ones between pole and focus so don’t get confused and be careful while drawing diagrams. The size of the image formed by the concave mirror goes on increasing as we move the object closer to the mirror. That’s why they are used as shaving mirrors and also in telescopes.