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Image Formation by Convex Lens

A lens having...

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A lens having focal lenght f and aperture size of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by black paper. Focal lenght of lens and intensity of image now will be?

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Q. A lens having focal length

f

and aperture of diameter

d

forms an image of intensity

I

. Aperture of diameter

\frac{d}{2}

in central region of lens is covered by a black paper. Now Focal length of lens and intensity of image will be respectively

Q. A thin lens of focal length

f

and aperture diameter

d

forms an image of intensity

I

. If the central part of the aperture upto diameter

d / 2

is blocked by an opaque paper, then the new focal length and intensity of image will be

Q. A thin lens of focal length

f

and its aperture diameter

d

, forms a real image of intensity

I

. Now the central part of the aperture of diameter

(\frac{d}{2})

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

Q. A thin lens of focal length

f

and its aperture diameter

d

, forms a real image of intensity

I

. 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

Q. A thin lens has focal length

f

, and its aperture has diameter

d

. If the central part of the aperture, of diameter

d / 2

is blocked by an opaque paper, the focal length of the lens and the intensity of image will become :

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