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Image Formation by Convex Lens

ntA lens havi...

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ntA lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively-n ntn nta) f/2 and I/2n ntb) f and I/4n ntc) 3f/4 and I/2n ntd) f and 3I/4n ntPl. tell correct option and whyn ntn

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Q. A lens having focal length

f

and aperture of diameter

d

forms an image of intensity

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. Aperture of diameter

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Q. A thin lens focal length

f_{1}

and its aperture has diameter d. It forms an image of intensity I. Now the central part of the aperture upto diameter

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Q. A thin lens of focal length

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and aperture diameter

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forms an image of intensity

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Q. A thin lens of focal length

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and its aperture diameter

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, forms a real image of intensity

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. Now the central part of the aperture of diameter

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is blocked by an opaque paper. The focal length and image intensity would change to

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and its aperture diameter

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, forms a real image of intensity

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. Now the central part of the aperture upto diameter

(\frac{d}{2})

is blocked by an opaque paper. The focal length and image intensity would change to

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