Geometrical OpticsMediumBloom L3
Question
A lens of focal length ′f′ is placed in between an object and screen at a distance ′D′. The lens forms two real images of object on the screen for two of its different positions, a distance ′x′ apart. The two real images have magnifications m1 and m2 respectively (m1 > m2). Then :-
Options
A.f = 
B.m1m2 = 1
C.f = 
D.D ≥ 4f
Solution
For convex lens
m1 - m2 = 
.......(ii)
.......(i) x = v - u .......(iii)
Using (i) & (ii) & (iii)
f =
m1 - m2 = .......(ii) .......(i) x = v - u .......(iii)Using (i) & (ii) & (iii)
f =
Create a free account to view solution
View Solution FreeMore Geometrical Optics Questions
A transparent solid cylindrical rod has a refractive index of . It is surrounded by air. A light ray is incident at the ...A thin glass (refractive index 1.5) lens has optical power of -5 D in air. its optical power in a liquid medium with ref...A disc is placed on the surface of a pond which has refractive index 5/3. A source of light is placed 4m below the surfa...If an object is placed 10 cm in front of a concave mirror of focal length 20 cm, the image will be...In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens after refraction:...