Question

An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre
'O' of a convex lens of focal length 20 cm. Draw a ray diagram to find the position
and size of the image formed. Mark optical centre 'O' and principal focus 'F' on the
diagram. Also find the approximate ratio of size of the image to the size of the object.
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Answer 1

refer attachment for your soln

Answer 2

Answer:

Explanation:

K=  ΔV/V

p=∴ΔV=  K

PV

P=hρg=200×10  

3 ×10N/m  2

K=22000 atm=22000×10  5

N/m  

2

V = 1m  

3

ΔV=  

22000×10  

5

200×10 3

×10×1

=9.1×10  

−4m  3