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Lens Formula

Why goggles S...

Question

Why goggles (Sun glasses) have zero power even though their surfaces are curved?

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Solution

Both the surfaces of the Sun glasses are curved in the same direction. Moreover, the radius of curvature is same for both the surfaces.Therefore, P = (n -1) ( $\frac{1}{R}$ - $\frac{1}{R}$ ) = 0

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Why goggles (Sun glasses) have zero power even though their surfaces are curved? [2 MARKS]

Q. Assertion :Although the surface of goggles' lens is curved, it does not have any optical power. Reason: In case of goggles, both the curved surfaces have equal radii of curvature and have centre of curvature on the same side.

Q. The lens of the goggles are curved but why doesn't it has power?

Q. Assertion :Although the surfaces of goggle lenses are curved, it does not have any power. Reason: In case of goggle, both the curved surfaces have equal radii of curvature and have center of curvature on the same side.

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