Question

A beam of light converges to a point P. A concave lens of focal length 16 cm is placed in the path of the convergent beam 12 cm from P. How far from the lens does the beam converge?

A
12 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
7.5 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
36 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
48 cm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 48 cm Lens formula is given by 1v−1u=1f ⇒v=fuf+u Here, the rays are initially about to converge at point P. Hence P acts as the virtual object for concave lens. u=+12 cm and f=−16 cm Hence, f=(−16)(12)−16+12 =4×12=48 cm

Suggest Corrections
12
Related Videos
Thin Lenses: Extended Objects
PHYSICS
Watch in App