Question

Good morning friends i will ask a general knowledge questions
1.What sis the power of concave lens
ans.
2.What is the symbol of Element lead
ans.
3.Magnatism at the centre of a bar magnet
ans.​

Answer 1

Answer:

1 : negative

2: pb

3: zero .

Answer 2

Answer:

1. negative

Why:-

The power of the concave lens is negative. Concave lens surfaces have a virtual radius of curvature, and thus a negative curvature. Optical power is denoted by the same convention signs that are used for focal length.

2.Pb

Why:-

The symbol Pb for lead is an abbreviation of the Latin word for lead, plumbum.

Atomic number: 82

Atomic weight: 207.19

Boiling point: 1,744 °C (3,171.2 °F)

3. zero

Why:-The magnetic field at the center of a bar magnet is zero in ideal case. The field lines near the center is parallel to the bar magnet. The density of the field lines is maximum at the poles of the bar magnet and zero at the center which means that the magnitude of the magnetic field is small at the center.

Explanation:

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