Question

An object 3cm high produces a real image 4.5 cm high when placed at a distance of 20 cm from a conclave mirror ca lcuate the position of image focal length of the conclave mirror​

Answer 1

Answer:

Here

object height h1=3cm

image height h2=4.5cm

we know

m=h2/h1=-v/u

so,

4.5/3=-v /-20 (object distance =20)

4.5×-20/3=-v

v=30cm

so image is 30 cm from the mirror.

now , using mirror formula

1/u+1/v=1/f

1/-20+1/-30=1/f

-5/60=1/f

-1/12=1/f

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Answer 2

Answer:

hope so it will helpful to you