
The graph shows the variation of with change in for a mirror. Points plotted above the point on the curve are for values of :
(A) Smaller than
(B) Smaller that
(C) Larger than
(D) Larger than

Answer
148.5k+ views
Hint: - Use the mirror formula that gives a relation , and and find an expression for in the terms of and . Then find the relation between and at the point . Take a value of greater than and find the relation between and .
Formula used:
Complete step-by-step solution:
Here, is the position of the object and is the position of the image with respect to the mirror. is the focal length of the mirror.
The relation between , and is given by .
On further solving we get,
.......
From the graph of versus we can understand that as the object comes towards the mirror ( as we reduce the object distance), the image distance increases. This means that is inversely proportional to .
Let us analyze the relation between and at the point . In the graph, we can see that the point also lies on a line passing through the origin and making an angle of with the positive x-axis.
From geometry, we know that the and coordinates of the points on a line passing through the origin and making an angle of with the positive x-axis are equal.
This means that at this point ,
Now, since the is inversely proportional to and at the point , , the value of will be greater than the value of for the points above point .
Therefore, let , where is a real number greater than one.
.
Substitute this value of in the equation .
Now further solving the equation we get,
But
This means that
This finally means that
Therefore, the value of is larger than for the points above the point .
So, the correct answer is option (D).
Note: As a convex mirror produces a diminished image of a far object, a driver can easily see large traffic behind him in a small mirror. In a concave mirror which is used as a shaving mirror when we hold the face closer to the mirror, an enlarged image is produced. It is easy to understand which type of mirror is used once you understood their principle of working.
Formula used:
Complete step-by-step solution:
Here,
The relation between
On further solving we get,
From the graph of
Let us analyze the relation between
From geometry, we know that the
This means that at this point
Now, since the
Therefore, let
Substitute this value of
Now further solving the equation we get,
But
This means that
This finally means that
Therefore, the value of
So, the correct answer is option (D).
Note: As a convex mirror produces a diminished image of a far object, a driver can easily see large traffic behind him in a small mirror. In a concave mirror which is used as a shaving mirror when we hold the face closer to the mirror, an enlarged image is produced. It is easy to understand which type of mirror is used once you understood their principle of working.
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