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प्रश्न
What is the effect on the size and position of the image of moving the object (i) towards the lens, and (ii) away from the lens?
उत्तर
When an object is moved towards the lens, the size of the image starts increasing. The position of the image starts moving away from the lens and towards infinity (on the right side of the lens) till the object is placed at the focus. When the object is moved closer to the lens, the image is formed behind the object (left side of the lens). This image is virtual, erect and magnified in size.
(ii) When the object is moved away from the lens, the image so formed moves closer to the lens and gets diminished in size.
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संबंधित प्रश्न
State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).
What type of image/images are formed by:
a concave mirror?
Give two uses of a convex mirror. Explain why you would choose convex mirror for these uses.
Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be:
(a) plane
(b) concave
(c) convex
(d) either concave or convex
The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn.
Figure
(a) Which mirror is convex
(b) Which mirror is concave
Give reasons for your choice.
A shop security mirror 5.0 m from certain items displayed in the shop produces on-tenth magnification.
What is the radius of curvature of the mirror?
Name two factors on which the focal length of a lens depends.
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
State two uses of a convex mirror.
The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?
