Qstnid -19- The Image Of A Small Electric Bulb Fixed On The Wall Of A Room Is To Be Obtained On The Opposite Wall 3 M Away By Means Of A Large Convex Lens. What Is The Maximum Possible Focal Length Of The Lens Required For The Purpose? - 09: Ray Optics And Optical Instruments - Neet-xii-physics

Home Learn Fast select Course

Show Unit/Chapter Change Unit Change Subject Last Menu

NEET-XII-Physics

09: Ray Optics And Optical Instruments

II - page 2

Qstn# 19 Prvs-Qstn Next-Qstn

#19
The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?

Ans : Distance between the object and the image, d = 3 m

Maximum focal length of the convex lens =

For real images, the maximum focal length is given as:

Hence, for the required purpose, the maximum possible focal length of the convex lens is 0.75 m.