(D) The power $P$ of a lens is given by $P = 1/f$, where $f$ is the focal length in meters.For a convex lens, $f$ is positive, and for a concave lens,

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$A$ convex lens has a power of $4 \, \text{D}$ and a focal length of $0.25 \, \text{m}$.

(D) The power $P$ of a lens is given by $P = 1/f$, where $f$ is the focal length in meters.For a convex lens, $f$ is positive, and for a concave lens, $f$ is negative.For option $D$: $A$ convex lens has $f = +0.25 \, \text{m}$.$P = 1 / 0.25 = +4 \, \text{D}$.Thus, a convex lens with a focal length of $0.25 \, \text{m}$ has a power of $4 \, \text{D}$.

Class 10 Science Light – Reflection and Refraction Spherical Lenses, Lens Formula and Power

Medium

Which of the following statements is correct?

A
$A$ concave lens has a power of $-4 \, \text{D}$ and a focal length of $0.25 \, \text{m}$.
B
$A$ convex lens has a power of $-4 \, \text{D}$ and a focal length of $0.25 \, \text{m}$.
C
$A$ concave lens has a power of $4 \, \text{D}$ and a focal length of $0.25 \, \text{m}$.
D
$A$ convex lens has a power of $4 \, \text{D}$ and a focal length of $0.25 \, \text{m}$.