Question

An object 10cm tall is placed on the principal axis of a convex mirror of
focal length 30cm at a distance of 20cm from the
pole. Find the Nature, size and position and magnification
of the image formed on the principal axis ( by graphically construction).
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Answer 1

Answer:

v=12. h'=+6

Explanation:

1/v+1/u=1/f

v=

u=-20

f=30

1/v=1/f-1/u

= 1/30-1/-20

= 1/30+1/20

=30+20/600

=50/600

1/v=. 1/12

v=12

m=h'/h=-v/u h=10

h'=-vh/u

=-12×10/-20

= -120/-20

=. +6 virtual and erect