Two thin lenses whose powers are +2 D and -4 D respectively combi… - Vidyadip

MCQ

Two thin lenses whose powers are $+2 D$ and $-4 D$ respectively combine, then the power of combination is

✓
$-2 D$
B
$+2 D$
C
$-4 D$
D
$+4 D$

✓

Answer

Correct option: A.

$-2 D$

$ P=P_1+P_2=2 D-4 D=-2 D$.

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