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A concave lens has a power of 0.1 cm<sup>-1</sup> - Leaving Cert Physics - Question e - 2008

Question e

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A concave lens has a power of 0.1 cm<sup>-1</sup>. What is the focal length of the lens?

Worked Solution & Example Answer:A concave lens has a power of 0.1 cm<sup>-1</sup> - Leaving Cert Physics - Question e - 2008

Step 1

Determine the relationship between power and focal length

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Answer

The power (P) of a lens is related to its focal length (f) by the formula: $P = \frac{1}{f}$ In this case, the power of the lens is given as 0.1 cm<sup>-1</sup>.

Step 2

Substitute the power value into the formula

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Answer

Substituting the value of power into the formula gives us: $0.1 = \frac{1}{f}$

Step 3

Rearrange the equation to find the focal length

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Answer

To find the focal length, rearranging the equation provides: $f = \frac{1}{0.1}$

Step 4

Calculate the focal length

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Answer

Carrying out the calculation results in: $f = 10\text{ cm}$

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