Geometrical OpticsMedium
Question
Diameter of a plano-convex lens is 6cm and thickness at the center is 3 mm. If speed of light in material of lens is 2 × 108 m/s, the focal length of the lens is :
Options
A.15 cm
B.20 cm
C.30 cm
D.10 cm
Solution
From trigonometry,
R2 = (3)2 + (R- 0.3)2
∴ from Lens-Maker formula,
f = 30cm
Create a free account to view solution
View Solution FreeMore Geometrical Optics Questions
A right angled prism of refractive index μ1 is placed in a rectangular block of refractive index μ2, whichis s...An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm. The focal length of objectiv...A ray of light is incident on the surface of separation of a medium with the velocity of light at an angle 450 and is re...A thin prism P1 with angle 6o and made from glass of refractive index 1.54 is combined with another thin prism P2 of ref...A plane mirror produces a magnification of...