Question

A point object is placed at a dist. 25 cm from
convex mirror of focal length 'f'. A plane
mirror is placed at a dist 20 cm from
object, in such a
way that there is no
parallex
b/w 2 virtual
images formed by these mirrors.
find 'f'. ​

Answer 1

The image formed by the plane mirror as well as by the convex mirror is at I.

Distance between object and plane mirror is (25−5)cm=20cm

∴ Distance between plane mirror and the image MI=20cm⟹PI=v=+15cm

Let the focal length of the convex mirror be fcm.

Using mirror formula,

v

1

+

u

1

=

f

1

∴

15

1

+

−25

1

=

f

1

⟹f=+37.5cm

solution

Answered By=shreyash. ..........

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