Question

The net focal length of the combination of two lenses of power –2.75 D and 0.25 D is

Answer 1

Answer:

2.35p is the answer mark me as brain list

Answer 2

Answer:

The net focal length of the combination of two lenses is -40 cm

Explanation:

The concentration can also be assessed through the dissection of the two lenses' combined focal lengths. The combined focal length is infinite if the separation distance is equal to the total of the focal lengths $(d = f_1+f_2)$. The rays of light that have been refracted become parallel as a response.

Effective power $\frac{1}{F_{eff}} =\frac{1}{F_1}+\frac{1}{F_2}$

$=p_1+p_2$

=-2.75+0.25

=-2.5 D

$f_{eq}=-\frac{1}{2.5} \ m$

$=-\frac{100}{250}\times100\ cm$

f=-40 cm

Therefore, the net focal length of the combination of the two lenses is f=-40 cm.

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