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Answer

Focal length =1/power

So, f=1/(-2)

 f=-50cm, where (-) sign indicates that the lens is concave. 

Answer
Power of lens =1/ focal length(meters) . Focal length = 0.5 meters = 50 Cms
Answer

Power of lens =1/f(metres)

f = 1/(-2)=-50cm

Negative sign indicates that lens is concave. Focal length = (-50cm)

Answer

As D = 1/f,

so focal length of the lens will be 1/2f.

Also, as D is negetive, the nature of the lens is concave.

Answer
Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=50cm.
Answer
If power is -2 Dioptre, focal length will be 1/(-2) m f= -0.5m= -50cm The negative sign by sign convention indicates the lens is concave in nature
Answer

Since, Power P = -2 D, Focal length f = 100/(-2) = - 50 cm. 

The minus (-) signifies that the lens should be Concave .

Answer
Power=1/focal length (m) So,Focal length will be -0.5m=-50cm And-sign indicate that lens will be concave

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