A lens forms a real image of an object The distance from the object to the lens is u - Physics - Ray Optics And Optical Instruments

Question

A lens forms a real image of an object The distance from the object
to the lens is u cm and distance of the image
from the lens is v cm The given graphs shows variation of
v with
(i) What is the nature of the lens?
(ii) Using the graph, find the focal length of this lens

Pintu B. · Accepted Answer

Dear Student ,
From the graph, when u=20 cm , we have v = 20 cm
 For the convex lens forming a real iamge, u is negative and v and f are positive
 u= -20 cm  and v = +20cm Using this lens formula, 1f = 1v – 1u = 120 – 1-20= 110⇒f =+10 cm

Regards

A lens forms a real image of an object. The distance from the object to the lens is u cm and distance of the image from the lens is v cm. The given graphs shows variation of v with (i) What is the nature of the lens? (ii) Using the graph, find the focal length of this lens.

A lens forms a real image of an object. The distance from the object to the lens is u cm and distance of the image from the lens is v cm. The given graphs shows variation of v with
(i) What is the nature of the lens?
(ii) Using the graph, find the focal length of this lens.