A lense powet is +2d b lense power is -4d find the type of lences find its focal length
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Lens A:
➡️P=+D,,, since, power is +ve,, so the lens is convex lens
✴️ focal length f= 1/P = 1/2 =0.5m =50cm.
Lens B:
➡️ P=-4D,,, since power is -ve so lens is concave.
✴️ focal length f =1/P=1/-4 = - 0.25m
= - 25 cm.
____hope it help ✌️
➡️P=+D,,, since, power is +ve,, so the lens is convex lens
✴️ focal length f= 1/P = 1/2 =0.5m =50cm.
Lens B:
➡️ P=-4D,,, since power is -ve so lens is concave.
✴️ focal length f =1/P=1/-4 = - 0.25m
= - 25 cm.
____hope it help ✌️
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