Question

Two thin lenses of power -2D and +3D are placed in contact, then power and focal length of lens combination is :

1 point

+1D, -100 cm

+1D, +100 cm

-1D, -20 cm

-1D, +20 cm

​

Answer 1

Answer:

+1D, -100 cm

Step-by-step explanation:

-2D +3D = +1D

Convex mirror is always positive➕ Power,So it's focal length is always negative (because Centre of Curvature is inside the Mirror ----->( [Convex Mirror]

P =1/f

=> +1D = 1/f

+1D=1 Meter = 100 cm

F is negative (-) So, It's focal length is -100 cm

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