Question

a convex lens of focal length 20cm is placed coaxially in contact with a concave lens of focal length 25cm. Determine the power of combination. Will the system be converging or diverging in nature??

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Answer 1

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Answer 2

Focal length of Convex lens = 20 cm

Focal length of Concave lens = -25 cm

When the 2 lenses are placed in contact,

We need to add the focal lengths.

$power \: of \: lens = \frac{100}{f _{1}(in \: cm) } + \frac{100}{f _{2}(in cm) }$

$\implies \: power = \frac{100}{20} + \frac{100}{ - 25}$

$\implies \: power = 5 - 4$

$\implies \: power = 1D$

$\therefore \large{ \boxed{Power= 1 \: D}}$

Since power is positive, the system will be converging or convex lens