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प्रश्न
At what distance from a converging lens of focal length 12 cm must an object be placed in order that an image of magnification 1 will be produced?
उत्तर
Magnification 1 means that the image distance is the same as the object distance and the size of image is the same as the object.
This happens only if the position of the object is at 2f, i.e,`2xx` focal length.
Thus, the object must be placed at a distance of 24 cm`(2xx12)` from the converging lens.
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संबंधित प्रश्न
The image formed by a concave mirror is real, inverted and of the same size as the object. The position of the object must then be:
(a) at the focus
(b) between the centre of curvature and focus
(c) at the centre of curvature
(d) beyond the centre of curvature
A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. Which of the following object distance should be chosen for this purpose?
(i) 10 cm
(ii) 15 cm
(iii) 20 cm
Give reason for your choi
If the magnification of a body of size 1 m is 2, what is the size of the image?
Fill in the following blank with suitable word:
If the magnification has a plus sign, than image is ......... and.........
The filament of a lamp is 80 cm from a screen and a converging lens forms an image of it on a screen, magnified three times. Find the distance of the lens from the filament and the focal length of the lens.
Linear magnification produced by a convex lens can be:
(a) less than 1 or more than 1
(b) less than 1 or equal to 1
(c) more than 1 or equal to 1
(d) less than 1, equal to 1 or more than 1
A convex lens produces a magnification of + 5. The object is placed:
(a) at focus
(b) between f and 2f
(c) at less than f
(d) beyond 2f
If a magnification of, –1 (minus 1) is obtained by using a converging lens, then the object has to be placed:
(a) within f
(b) at 2f
(c) beyond 2f
(d) at infinity
What is meant by magnification? Write its expression. What is its sign for real image and virtual image?
Magnification for the convex mirror is ______.
