Question

The power of concave lens having focal
length 40 cm is equal to​

Answer 1

$\large{P = \frac{1}{f(m)}}$

$\large{P= \frac{100}{f(cm)}}$

$\large{ P= \frac{100}{40}}$

$\huge\red{\boxed{\pink{P = 2.5D}}}$

$\large\red{\underline{\underline{\orange{\mathbb{MARK\:AS\:BRAINLIEST}}}}}$