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Image Formation by Convex Lens

If half the p...

Question

If half the portion of a convex lens is covered, the focal length ..................... change, but intensity of image..................

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Solution

does not, decreases

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Q. If half part of a convex lens is covered, the focal length _____ change, but the intensity of the image ________.

If half part of a convex lens is covered, the focal length ___________ and the intensity of image __________.

Complete the following sentences :

(a) If half of a convex lens is covered, the focal length ..................... change, but the intersity of image ......................

(b) A convex lens is placed in water. Its focal length will ..................

(c) The focal length of a thin convex lens is ............... than that of a thick convex lens.

Q. While obtaining the image of a candle by a convex lens, if lower half portion of the lens is blackened to make it opaque completely, then the intensity of the image will be :

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

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