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JAMB Physics 2018 Paper

Question : 48

Total: 87

Solution:

Concept:

The mirror formula and linear magnification formula are used to find the image magnification for a concave mirror.

Explanation:

The mirror formula is

\frac{1}{f} = \frac{1}{u} + \frac{1}{v}

Given:

u = 20\,\text{cm}

and

f = 10\,\text{cm}

Substitute the values:

\frac{1}{10} = \frac{1}{20} + \frac{1}{v}

So,

\frac{1}{v} = \frac{1}{10} - \frac{1}{20} = \frac{1}{20}

Therefore,

v = 20\,\text{cm}

Linear magnification is

M = \frac{v}{u}

Thus,

M = \frac{20}{20} = 1

Answer:

C. 1

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