Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Physics Optics Refraction and Reflection

An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D. Focal length of each of the convex lens is :

1

20 cm

2

50 cm

3

500 cm

4

25 cm

5

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