Question

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

Good question,

Here is your perfect answer!

Here u = - 50cm,

v = - 10cm

(Sign convention),

Applying len's formula,

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

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

=) 1/f = - 1/10 + 1/50

=) 1/f = (-5+1)/50

=) 1/f = - 4/50

=) f = - 50/4

=) f = - 12.5cm.

Answer 2

Answer:

your answer is in the attachment ✅❣️✅

just applying the lens formula