A screen is placed at a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens

Must be less than 10 cm

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Must be greater than 10 cm

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Must not be greater than 20 cm

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Must not be less than 10 cm

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Solution

The correct option is B
Must be greater than 10 cm

Now, if the image is not being formed on the screen it clearly means the image is being formed beyond the screen or, on the object side of the lens looking at both the cases, we can say that the focal length of the lens must be greater than 10 cm.

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Q. A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and its is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens
(a) must be less than 10 cm
(b) must be greater than 20 cm
(c) must not be greater than 20 cm
(d) must not be less than 10 cm.

Solve:

(1) An object of size 7 cm is placed at 25 cm in front of concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed, so that we can get a sharp and clear image. Find nature and size of the image.

(2) An object of height 5 cm is held 20 cm away from converging lens of focal length 10 cm. Find the position, nature and size of the image formed.

(3) An object is placed at a distance of 10 cm from a convex lens of focal length 12 cm. Find the position and nature of the image.

A screen is placed at a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens

Q. A light source is placed 100 cm away from a screen. A converging lens placed at a certain position between the source and the screen focuses the image of the source on the screen. The lens is moved a distance of 40 cm and it is found that it again focuses the image of the source on the screen. The focal length of the lens is :

Q. study the given diagram in which a convex lens forms a virtual image of an object placed at a distance of 10 cm from it. the focal length of the lens must be
a equal to 10cm
b greater than 10cm
c less than 10cm

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A screen is placed at a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens

The correct option is B Must be greater than 10 cm Now, if the image is not being formed on the screen it clearly means the image is being formed beyond the screen or, on the object side of the lens looking at both the cases, we can say that the focal length of the lens must be greater than 10 cm.

The correct option is B
Must be greater than 10 cm

Now, if the image is not being formed on the screen it clearly means the image is being formed beyond the screen or, on the object side of the lens looking at both the cases, we can say that the focal length of the lens must be greater than 10 cm.