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Two lenses of powers $+ 1.5 D$ and $+ 0.25 D$ are placed in contact. What is the resultant power of the lens combination?

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1.5 D

1.75 D

1.8 D

None of the above

answer is B.

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Detailed Solution

Two lenses of powers

+ 1.5 D

and

+ 0.25 D

are placed in contact. The resultant power of the lens combination is

1.75 D

It is known that the resultant power of the combination is given by the sum of the individual power of the lenses. In this case, it can be written as,

P = P_{1} + P_{2}

Where

P

P_{1}

and

P_{2}

are the resultant power, power of lens

1

and power of lens

2

, respectively.
On substituting the values, we get the resultant power as

\Rightarrow P = P_{1} + P_{2}

\Rightarrow P = 1.5 + 0.25

\Rightarrow P = 1.75 D

Hence, the resultant power is

1.75 D

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