Question

PQR & S in convex lenses with 20cm, 15cm, 5cm, 10cm confluence respectively. Lens with more optical power i​

Answer 1

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Answer 2

Given:

The Focal length of P $=20\ cm$

The Focal length of Q $=15\ cm$

The Focal length of R $=5\ cm$

The Focal length of S$=10\ cm$

To Find:

A Lens with more optical power

Solution:

Optical power can be found by the Formula

For P

$Optical\ Power\ of \ P=\dfrac{1}{focal\ length}\\\\=\dfrac{1}{20}$

$=0.05$

For Q

$Optical\ power=\dfrac{1}{15}\\=0.067$

For R

$Optical\ power=\dfrac{1}{5}$

$=0.2$

For S

$Optical\ power=\dfrac{1}{10}\\=0.1$

The lens with a less focal length has more optical power so it is $R$.