Power of given lens is +25 D. Find the distance FO.
Dikshu uses spectacle to remove his defect of eye having power -0.5 D. What type of lens has he used , focal length of the lens, defect of vision.
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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