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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
Which type of mirror has:
negative focal length?
What type of image/images are formed by:
a concave mirror?
State whether the following statement is true or false:
A diverging mirror is used as a rear-view mirror.
Draw diagram to show how a convex mirror can be used to give a large field of view.
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:
at 2F1,
An object is placed at the following distance from a convex lens of focal length 15 cm:
(a) 35 cm
(b) 30 cm
(c) 20 cm
(d) 10 cm
Which position of the object will produce:
(i) a magnified real image?
(ii) a magnified virtual image?
(iii) a diminished real image?
(iv) an image of same size as the object?
Light travels in the same straight line path while passing through different media.
Write true or false
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
Numerical problem.
A concave mirror produces three times magnified real image of an object placed at 7 cm in front of it. Where is the image located? (Ans: 21 cm in front of the mirror)
As you move an object always from a convex mirror, its image becomes ______
and moves towards ______.
