The image of an object formed by a lens on the screen is not in sharp focus. Suggest a method to get a clear focussing of the image on the screen without disturbing the positions of the object, the lens or the screen.

The image of an object formed by a lens on the screen is not in sharp

1.	The image of an object formed by a lens on the screen is not in sharp focus. Suggest a method to get a clear focussing of the image on the screen without disturbing the positions of the object, the lens or the screen.
Answer» Solution :For GETTING a SHARP IMAGE, we have to use light ofsuitable WAVELENGTH. This is because focal length: of a lens depends upon wavelength.

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The image of an object formed by a lens on the screen is not in sharp focus. Suggest a method to get a clear focussing of the image on the screen without disturbing the positions of the object, the lens or the screen.

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