1.

If a spherical lens has a power of, - 0.25 D, the focal length of this lens will be : (a) - 4 cm (b) - 400 mm (c) - 4 m (d) - 40 m

Answer»

If a spherical lens has a power of, - 0.25 D, the focal length of this lens will be : (a) - 4 cm (b) - 400 mm (c) - 4 m (d) - 40 m



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