The surface of the sun glasses (goggles) are curved, yet their power may be zero. Why ?

The surfaces of the sun glasses (goggles) are curved, yet their power may be zero. Why ?

The sun glasses have curved surfaces, but their power zero. Why?

Statement-I : Sun glasses have zero power even through their surfaces are curved. and Statement-II: Both surface of the sun glasses are curved in the same direction with same radii.

Statement-I : Sun glasses have zero power even through their surfaces are curved. and Statement-II: Both surface of the sun glasses are curved in the same direction with same radii.

Statement-I : Sun glasses have zero power even through their surfaces are curved. and Statement-II: Both surface of the sun glasses are curved in the same direction with same radii.

Assertion : Although the surfaces of a goggle lens are curved, it does not have any power. Reason : In case of goggles, both the curved surfaces have equal radii of curvature.

Although the surfaces of a goggle lens are curved,it does not have any power.Explain,why.

Assertion:Although the surfaces of goggle lens are curved, It does not have any power. Reason: In case of goggles, both the curved surfaces have equal radii of curvature and have centre of curvature on the same side.