Question

an object is placed on the principal axis at 25cm away from a convex lens of focal length 20cm .The position of the image find​

Answer 1

$\boxed{\bf{\blue{\longrightarrow Answer:}}}$

• u = -25cm
• f = 20 cm
• Using lens formula
• $\frac{1}{v} = \frac{1}{f} + \frac{1}{u}$
• $\frac{1}{v} = \frac{1}{20} - \frac{1}{25}$
• $v = 100cm$