Amity University, Noida B.Tech Admissions 2024
ApplyAsia's Only University with the Highest US & UK Accreditation
Power of lens and mirror is considered one of the most asked concept.
12 Questions around this concept.
A person has been using spectacles of power −1.0 dioptre for distant vision and a separate reading glass of power 2.0 dioptres. What is the least distance of distinct vision for this person :
A convex lens and a concave lens, each having same focal length of are put in contact to form a combination of lenses. The power in diopters of the combination is:
Two lenses are placed in contact with each other and the focal length of combination is . If the focal length of one is , then the power of the other will be:
An achromatic convergent doublet of two lenses in contact has a power of . The convex lens has power . What is the ratio of the dispersive powers of the convergent and divergent lenses?
The nearer point of the hypermetropic eye is . The lens to be used for its correction should have the power:
Power and lens and mirror-
Power of a lens is defined as the reciprocal of focal length and Power of a mirror is defined as the negative of reciprocal of focal length.
So,
Where, f = focal length
The unit of power is Diopter, 1D = 1 m-1
The sign of the focal length will be taken according to the sign convention which we have discussed in the previous concept.
The power of a combination of lenses in contact is the algebraic sum of the powers of individual lenses, so it can be written as -
"Stay in the loop. Receive exam news, study resources, and expert advice!"