Answer :

a)

i) a)


Given,


Focal length (f) =+10 cm


Object length (u) = -15 cm


According to the lens formula,







Hence, the image formed is virtual and 30 cm behind the mirror.


Magnification of the object (m) =




So, the image is inverted and magnified.


b) Object length (u) = -8 cm


According to the lens formula,







Hence, the image is real and in front of the mirror.


Magnification of the object (m) =





So, the image is magnified and erect.


ii) In a film projector the image of the film is projected on a screen; to achieve this we have to get a real image of the film. So, this can be achieved by the second case of the above problem.



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