Question

Focal length of a concave mirror is f.The distnace from its focal length its focal point to the object is P.Find the ration of heights of image​

Answer 1

and the distance from the object to the principal focus is p. The ratio of the size of the real image to the size of the object is:

A .

−pf

B .

(pf)2

C .

(pf)21

D .

−fp

E .

−fp

December 20, 2019Apoorva Vedwal

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ANSWER

Distance of object is u=−(f+p)

v1+u1=f1 gives:

v1−f+p1=−f1

or, v1=−f1+f+p1

or, v1=−(f+p)×fp

or, v=fpp