Question

A Convex Lens Has A Focal Length Of 15cm At What Distance Should The Object From The Lens Be Placed,So That It Forms An Image at 10 cm From The Lens. Find The Magnification Produced By The Lens​

Answer 1

Explanation:

Correct option is

A

5 cm

Given data,

f=15cm

v=30cm

h=−5cm

u=?

⇒f1=v1−u1

⇒u1=v1−f1

=301−151

=301−2

=30−1

⇒u=−30cm

Also we know that,

m=u+v=hh′

⇒30−30=−5h

⇒h=+5

∴object height=5cm