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Combining the powers, ( as they can be added algebraically),
P(total) = P1 + P2 = 5 + (-2) = 3 D
Now focal length is reciprocal of Power, so here, focal length will be,
1/P(total) = 1/3 = 0.333m ( As D is SI unit, so even length will also be in SI units.
Now 0.333 m = 33.3 cm.
So option (B) is correct
P(total) = P1 + P2 = 5 + (-2) = 3 D
Now focal length is reciprocal of Power, so here, focal length will be,
1/P(total) = 1/3 = 0.333m ( As D is SI unit, so even length will also be in SI units.
Now 0.333 m = 33.3 cm.
So option (B) is correct
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