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Image in Thin Lens by Ray Tracing

A screen is p...

Question

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

A

Must be less than 10 cm

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B

Must be greater than 10 cm

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C

Must not be greater than 20 cm

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D

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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