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## Answers

1÷v=1÷f+1÷u

where, v= image distance

u= object distance

f= focal length

To find out the nature-

m = v÷u

where, m= magnification

If m is negative then nature is real and inverted.

If m is positive then nature is virtual an erect.

To find out size-

when v,u and ho ( object size) is given to find hi (image size)-

hi÷ho= v÷u