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

Create a free account to view solution

View Solution Free
Topic: Geometrical Optics·Practice all Geometrical Optics questions

More Geometrical Optics Questions

n the ideal double-slit experiment, when a glass-plate (refrective index 1.5) of thicness t is introduced in the path of...Two convex lens of focal length 20 cm and 25 cm are placed in contact with each other, then power of this combination is...A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 ...The intensity of light from a source decreases with the distance x from the source, as picture, the intensity of light f...Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is &#9...