Power of given lens is +25 D. Find the distance FO.
A person wears spectacles of power -1D.Find defect of eye and f.
Power of lens is 2.5 dioptre, find focal length,type of lens.
An object is kept 45cm away, convex lens of power 10D. locate the image formed by the lens with a ray diagram.
Prapti uses a convex lens of focal length 20 cm in her spectacles. Find the power of lens.
An object is placed in front of convex lens, f = 4 cm then draw a ray diagram of image, calculate magnification, power of lens ?
A man uses spectacles, power 5D then calculate focal length. what is the vision defect?
If the power of lens is -2.5 D, what is the focal length of the lens ?
A lens with focal length -10 cm. Calculate the power of lens. Also , state the nature of lens.
A hand lens has 25D. Where should the lens be kept to read the letters of book?
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