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प्रश्न
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:
between F1 and the optical centre O of the lens.
Which of the above two cases shows the use of convex lens as a magnifying glass? Give reasons for your choice.
उत्तर
When the object is placed between F1 and the optical centre O of the lens, the image formed by the convex lens is behind the object (left of the lens). This image is virtual, magnified and erect as shown in the figure.
is used as a magnifying glass. The reason being, the image of an object that is placed between F1 and the optical centre is virtual and magnified, which is the requirement of a magnifying glass.
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संबंधित प्रश्न
What is meant by (i) principal focus of a convex mirror, and (ii) focal length of a convex mirror?
State whether the following statement is true or false:
A diverging mirror is used as a rear-view mirror.
The magnification produced by a spherical mirror and a spherical lens is + 0.8.
(a) The mirror and lens are both convex
(b) The mirror and lens are both concave
(c) The mirror is concave but the lens is convex
(d) The mirror is convex but the lens is concave
A convex mirror is used
Nature of the images formed by a convex mirror is _______.
Magnification produced by a rear view mirror fitted in vehicles
Assertion: Convex mirrors are used as a rearview mirror in vehicles for observing traffic at our back.
Reason: A convex mirror has a much larger field of view.
The image formed by a convex mirror is always ______.
As you move an object always from a convex mirror, its image becomes ______
and moves towards ______.
Assertion: A real image cannot be produced by plane or convex mirror.
Reason: The focal length of a convex mirror is always taken as positive.
