1.

Find the focal length of a lens of power -2 D. Aslo state the type of lens.

Answer»

Solution :Solution : P = ` 1/(f ("in meter")) `
-2 = `1/f `
f= `1/-2`
f= `1/2 xx 100 `
f = -50
`therefore` FOCAL LENGTH of lens = -50 CM


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