Question

Convex lens forms 30cm high image of an object placed at 15cm in front of convex lens of focal length 20cm obtain the height of object and position of the image.​

Answer 1

Answer:

object is placed at a distance of 30 cm from a convex lens of focal length 20 cm. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams. Image distance, v = ? v=60010=60 cm .22-Oct-2020

Answer 2

Explanation:

Here,

Image distance=v=20cm,

Object distance=u=−30cm,

Lens equation is given by,

v1−u1=f1,

putting the values we get,

201−−301=f1,

∴f=12cm

∴ Focal length of convex lens=f=12cm