A convex lens of focal length 30 cm is placed in contact with a concave lens of focal length 20 cm. An object is placed at 20 cm to the left of this lens system. The distance of the image from the len

Question

A convex lens of focal length 30 cm is placed in contact with a concave lens of focal length 20 cm. An object is placed at 20 cm to the left of this lens system. The distance of the image from the lens in cm is ________

TestHub · Accepted Answer

Equivalent focal length ​ f 1 ​ = f 1 ​ 1 ​ + f 2 ​ 1 ​ = 30 1 ​ + − 20 1 ​ = 60 2 − 3 ​ = − 60 1 ​ f = − 60 cm ​ Lens formula ​ v 1 ​ − u 1 ​ = f 1 ​ v 1 ​ − − 20 1 ​ = − 60 1 ​ v = − 15 cm ​

Physics - Geometrical Optics Question with Solution | TestHub

Options:

Doubts & Discussion