Question

two lenses having power +2D and -4D respectively are put together. calculate the power and nature of combination of two lenses

Answer 1

when they put together power = -4D +2D

= -2D

P=1/F

-2=1/F

F=1/-2

F= 0.5M

THE NATURE OF TWO COMBINE LENS IS CONCAVE BECAUSE POWER IS IN MINIUS.

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Answer 2

Answer:

-2D

Explanation: P =POWER

P1  = +2D

P2  = -4D

P= P1 +P2

P = +2D +(-4D)

P = 2D -4D

P = -2D

Nature of combination of two lenses  is concave lens as power is negative.