b). An object is placed in front of a convex lens such that the image formed has the same size as that of
the object. Draw a ray diagram to illustrate this.
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when the object is on 2f the image is of same size
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GiveN :-
- A object is placed in front of a convex lens .
To FinD :-
- At what distance from a convex lens should an object be placed on the axis so as to form a real image of the same size? Illustrate your with a ray diagram .
SolutioN :-
Here we need to find at what distance from a convex lens should an object be placed on the axis so as to form a real image of the same size. So let us assume that the focal length of the lens be f . And the height of object = height of the image = h .
For this the object should be placed at 2F , in order to obtain a image of same height . For the ray diagram refer to the attachment .
• P R O O F :-
According to the sign Convention we know that the focal length of a convex lens is positive . So ,
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