You observe, at normal incidence, light of wavelength 483 nm reflected off the (air) interface between a plano-convex lens (curved side down) touching a flat piece of glass. You see a dark central spot surrounded by rings of darkness. The smallest ring has radius 187 μm. If the lens is made of glass with refractive index 1.532, what is the focal length of the lens in cm?

You observe, at normal incidence, light of wavelength 483 nm reflected off the (air) interface between a plano-convex lens (curved side down) touching a flat piece of glass. You see a dark central spot surrounded by rings of darkness. The smallest ring has radius 187 μm. If the lens is made of glass with refractive index 1.532, what is the focal length of the lens in cm?

Similar questions

A ray of sunlight is passing from diamond into crown glass; the angle of incidence is 29.60°. The indices of refraction for the blue and red components of the ray are: blue (ndiamond 2.444, ncrown glass = 1.531), and red (ndiamond 2.410, ncrown glass = 1.520). Determine the angle between the refracted blue and red rays in the crown glass. Number i = Units -
The index of refraction of the core of a piece of fiber optic cable is 1.72. If the index of the surrounding cladding is 1.41, what is the critical angle for total internal reflection for a light ray in the core incident on the core-cladding interface? a 55.1° b 44.0⁰ c 49.6° d 60.6°
A block of glass has an index of refraction equal to n_g=1.68. The glass is surrounded by oil which has an index of refraction of n_o=1.28. What is the largest incident angle (deg) possible in the glass before the ray undergoes total internal reflection?
Using filters, a physicist has created a beam of light that consists of three wavelengths: 400 nm (violet), 500 nm (green), and 650 nm (red). He aims the beam so that it passes through air and then enters a block of crown glass. The beam enters the glass at an incidence angle of 0, = 43.8°. The glass block has the following indices of refraction for the respective wavelengths in the light beam. wavelength (nm) 400 500 650 index of refraction n 400 nm = 1.53 n 500 nr = 1.52 n650 nm = 1.51 (a) Upon entering the glass, are all three wavelengths refracted equally, or is one bent more than the others? 400 nm light is bent the most 500 nm light is bent the most 650 nm light is bent the most all colors are refracted alike (b) What are the respective angles of refraction (in degrees) for the three wavelengths? (Enter each value to at least two decimal places.) (i) O400 nm (ii) O500 nm (iii) O650 n O nm
Using filters, a physicist has created a beam of light consisting of three wavelengths: 400 nm (violet), 500 nm (green), and 650 nm (red). She aims the beam so that it passes through air and then enters a block of crown glass. The beam enters the glass at an incidence angle of ?1 = 31.5°. The glass block has the following indices of refraction for the respective wavelengths in the light beam. wavelength (nm) 400 500 650 index of refraction n400 nm = 1.53 n500 nm = 1.52 n650 nm = 1.51 (a) Upon entering the glass, are all three wavelengths refracted equally, or is one bent more than the others? (b) What are the respective angles of refraction (in degrees) for the three wavelengths? (Enter each value to at least two decimal places.) (i) ?400 nm (ii) ?500 nm (iii) ?650 nm
In the figure, light is incident at angle θ1 = 37˚ on a boundary between two transparent materials. Some of the light travels down through the next three layers of transparent materials, while some of it reflects upward and then escapes into the air. If n1 = 1.26, n2 = 1.42, n3 = 1.32 and n4 = 1.45, what is the value of (a) θ5 and (b) θ4?
In the figure, light is incident at angle 8₁ = 39° on a boundary between two transparent materials. Some of the light travels down through the next three layers of transparent materials, while some of it reflects upward and then escapes into the air. If n₁ = 1.28, n₂ = 1.38, n3 = 1.34 and n4 = 1.45, what is the value of (a) 05 and (b) 04? 18₁ Air m n₂ 173 na