1.

Two lenses of power +12D and 2D are combined together. What is their equivalent focallength?a) 10 cmb) 12.5 cmc) 16.6 cmd) 8.33 cm

Answer»

Power of combination = 12.5 + (-2.5 )= 10 D wkt , p = 1/ff = 1/P= 1/10f = 0.1 m= 0.1 * 100 cm= 10 cm

Therefore , total power is 10 D and focal lenght is 10 cm or 0.1 m



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