Question

Can u help me out with this??
An illuminated object lies at a distance of 1 m from the screen placed at a distance 75 cm from the lens. Find
Focal length
Magnification

Answer 1

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Given: 

Image Distance ,(v)= 75 cm (right hand side)

Object distance, (u)= -1m = 100cm ( In convex lens object is in the left hand side)

Focal length, (f)= ??


Lens Formula

1/f=1/v−1/u

=1/75cm−1/(−100)

=1/300cm

f= 300 cm

f= 300/100

f=3m


Magnification, m=v/ u

=75/100

m =0.75

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