Question

A virtual image 3 times the size of the object is obtained with a concave mirror of raius of curvature 36 cm What is the distance of the object from the mirror​

Answer 1

Explanation:

m = 3

f = 18 cm

we know the eq, m = f / f -u

3 = -18 / -18 + u

-18 + u = -6

u = 12cm

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Answer 2

Answer:

12

Explanation:

r=36 then f will be 18 cm

let 3 virtual times be 3h

so m = -v/u so 3 will be v

so, by mirror formula it will be

1/18 = 1/3-1/u

-1/u = 1/18-1/3= 1-6/18= 1/12

and f = 12

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