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Image Formation by Concave Lens

In displaceme...

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In displacement method, there are two positions of a lens for which we get clear image . First position of lens is at 40cm from object and second is at 80cm , the focal length of lens i

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Q. In displacement method, there are two position of a lens for which we get clear image. First position of the lens is at

40 c m

from object and second is at

80 c m

, the focal length of lens is

Q. In lens displacement method, for the two positions of lens, lateral size of the images are

4 cm

9 cm

respectively. The size of the object is

Q. An object is placed at a distance of

100 c m

from a concave lens of focal length

40 c m

. Find the distance of the position of image from the lens in

c m

.

Q. In a lens displacement method, the distance between the object and screen is

70 cm

, and the focal length of the lens is

16 cm

. Find the separation between the sharp image positions of the lens.

Q. A convex lens when placed in the first position forms a real image of an object on a fixed screen. The distance between the object and the screen is

75 cm

. On displacing the lens from first position by

25 cm

to the second position, again a real image is formed on the screen. Then the focal length of the lens is

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