image of an light bulb is to be formed on the front wall 3 m away by using a convex lens what is the maximum focal length required?
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The maximum focal length required is of 3m.
As the light bulb acts as an infinity & point size object for a lens and the rays of light incidents parallel to the principal axis. After refraction, the refracted ray of light forms a point size image at the principal focus. As the image distance and the focal length are equal; so your answer is 3m
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As the light bulb acts as an infinity & point size object for a lens and the rays of light incidents parallel to the principal axis. After refraction, the refracted ray of light forms a point size image at the principal focus. As the image distance and the focal length are equal; so your answer is 3m
___________________________
HOPE THIS HELPED ;)
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