If the power of two lenses and $P_{1}$ and $P_{2}$ ; when they are combined; the effective power is:

P_{1} - P_{2}

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P_{1} + P_{2}

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P_{1} \times P_{2}

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\frac{P_{1}}{P_{2}}

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Solution

The correct option is B $P_{1} + P_{2}$
The effective power is $P_{1} + P_{2}$

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0.1 M NaCl and 0.1 M CH₃COOH are kept in separate containers. If their osmotic pressures Are P₁ and P₂ respectively then the correct statement is:

The atmospheric pressure at earth surface is $P_{1}$ and inside a mine is $P_{2}$ . They are related as :
(a) $P_{1} = P_{2}$

(b) $P_{1} > P_{2}$
(c) $P_{1} < P_{2}$

(d) $P_{2} = 0$

P_{1}

P_{2}

V verus T curves at constant pressures $P_{1}$ and $P_{2}$ for an idealgas are shown in the figure,

K N O_{3}

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