Question

If two lenses of focal lengths 5 cm and 10 cm are
placed in contact along the same axis, what will
be the power of combination of two lens?​

Answer 1

$\huge{\mathfrak{Answer:-}}$

${Focal Length_{1}}$ = 5 cm = 0.05m

Hence,

Power = $\frac{1}{0.05}$

Power= 20 D

${Focal length_{2}}$ = 10 cm = 0.1m

Hence,

Power = $\frac{1}{0.1}$

Power = 10 D

$\bf{\underline{Total\:Power}}$

10 + 20 = 30 D

______________________

Answer 2

Answer:

here is your answer

Explanation:

I hope it's help u

Thank you ❤️