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Cutting of Thin Lenses

Sudha finds o...

Question

Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of $15 c m$ from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?

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Solution

As the distance between viewer and the object increases, image sharpness decreases. So, Sudha should try to move the screen towards the lens to obtain sharp image of the buildings.
The approximate focal length is $15 c m$ .

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Q. Question 26
Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?

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