Q. 3

# i) Find the natur

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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