A lens with a focal length of 35cm is used to form an image of an object. When this lens is placed a certain distance X from the object, no image is formed. Give this distance X in cm.
Question
A lens with a focal length of 35cm is used to form an image of an object. When this lens is placed a certain distance X from the object, no image is formed. Give this distance X in cm.
Solution
The distance X is equal to the focal length of the lens. This is because when the object is placed at the focal point of a converging lens, the light rays after passing through the lens become parallel and do not meet, hence no image is formed. Therefore, the distance X is 35 cm.
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