Geometrical OpticsHard
Question
Two lenses of power -15 D and + 5D are in contact with each other. The focal length of the combination is
Options
A.- 20 cm
B.- 10 cm
C.+ 20 cm
D.+ 10 cm
Solution
P = P1 + P2 = - 10
f =
⇒ - 0.1 m ⇒ - 10 cm
f =
⇒ - 0.1 m ⇒ - 10 cmCreate a free account to view solution
View Solution FreeMore Geometrical Optics Questions
A convex lens is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times...When the object is at distance u1 and u2 image formed by the same lens real and virtual respectively and of the same siz...A point source is kept at the center of a spherically enclosed detector. If the volume of the detector increased by 8 ti...A man with defective eyes cannot see distinctly object at the distance more than 60 cm from his eyes. The power of the l...A ray of light passes through four transparent media with refrective indices μ1, μ2, μ3 and μ4 as sh...