Question

An object placed 50cm from a lens produces a virtual image at a distance of 10cm in front of lens. What is the focal length of lens?

Answer 1

An object placed 50cm from a lens produces a virtual image at a distance of 10cm in front of lens. What is the focal length of lens?

Good question,

Here is your perfect answer!

Here u = - 50cm,

v = - 10cm

(sign convention)

By lens formula,

=) 1/f = 1/v - 1/u

= - 1/10 - (-1/50)

= - 1/10 + 1/50

= - 5+1/50 = - 4/50

=) f = - 50/4

= - 12.5 cm.

Answer 2

Holaa Mate

Refer to the attachment..