Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Physics Wave

What will be the focal length of a convex lens with the power of a +2.5 Diopter?

1

20 cm

2

10 cm

3

40 cm

4

More than one of the above

5

None of the above

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