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Optics
8. Newton’s rings formed by monochromatic light between a flat glass plate and a plano-convex lens are viewed normally. Calculate the order of the dark ring which will have double the diameter of that of 40th dark ring.
Optics
A slit of width a is illuminated by white light
1. For what value of a will the first minimum for red light of wavelength 650nm appear at an angle 15°
2. What is the wavelength of the light whose first side diffraction maximum is at 15°, thus coinciding with the first minimum for the red light.
1. For what value of a will the first minimum for red light of wavelength 650nm appear at an angle 15°
2. What is the wavelength of the light whose first side diffraction maximum is at 15°, thus coinciding with the first minimum for the red light.
Optics
In a double slit experiment, the wavelength of the light source is 405nm, the slit separation d is 19.44*10^-6m and the slits width a is 4.050*10^-6m. Consider the interference of the light from the two paths and also the diffraction of the light through h slits.
1. How many bright interference fringes are within the central peak of the diffraction envelope
2. How many bright fringes are within either of the first side peaks of the diffraction envelope
1. How many bright interference fringes are within the central peak of the diffraction envelope
2. How many bright fringes are within either of the first side peaks of the diffraction envelope
Optics
A concave mirror is used in opthalmoscope. explain
Optics
In an experiment to investigate the refractive index of a glass block . the following reading were obtained..
i° | i° | MR | Sin i | sin r | Tan r
25.0 15.0 1.70 ? ? ?
30.0 20.0 2.20 ? ? ?
40.0 24.0 2.80 ? ? ?
50.0 28.0 3.40 ? ? ?
60.0 33.0 4.00 ? ? ?
70.0 40.0 5.10 ? ? ?
(I) Complete the above table
(ii) Determine the refractive index and width of the glass using the graph,if sin i=n sin r and W tan r=MR
(iii) Calculate the critical angle of a material having a refractive index of 1.52 when light passes from this material to air
i° | i° | MR | Sin i | sin r | Tan r
25.0 15.0 1.70 ? ? ?
30.0 20.0 2.20 ? ? ?
40.0 24.0 2.80 ? ? ?
50.0 28.0 3.40 ? ? ?
60.0 33.0 4.00 ? ? ?
70.0 40.0 5.10 ? ? ?
(I) Complete the above table
(ii) Determine the refractive index and width of the glass using the graph,if sin i=n sin r and W tan r=MR
(iii) Calculate the critical angle of a material having a refractive index of 1.52 when light passes from this material to air
Optics
calculate the critical angle of a material having a refractive index of 1.52 when light pass from this material to air
Optics
An object is placed 0.1 m infront of a convex lens of focal length 20 cm made of a material of refractive index 1.5. The surface of the lens away from the object is silvered. If the radius of curvature of the silvered surface is 22 cm. then the distance of the final image from the silvered surface is
Optics
Eye is most sensitive to 5500Å and the diameter of the pupil is about 2 mm. Find the
angular limit of resolution of eye.
angular limit of resolution of eye.
Optics
Compare the Fraunhofer diffraction patterns of single slit and double slits.
Optics
A girl of height 150 cm with her eye level at 140 cm stands in front of a plane mirror of height 75 cm fixed to a wall. The lower edge of the mirror is at a height of 85 cm above her feet level. The height of her image the girl can see in the mirror is
