The light of wavelength 600 nm is incident normally on a slit of width 3 mm. The linear width of central maximum on a screen kept 3 m away from the slit : –
(a) 1.2 mm
(b) 4.68 mm
(c) 2.1 mm
(d) 6.75 m
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A linearly polarized electromagnetic wave given as E=Eoicos(kz-ωt) is incident normally on a perfectly reflecting infinite wall at z = a.
(b) Er= Eoi cos(kz+ωt).
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A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally.
the angle of incidence is 2.5°.
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Consider sunlight incident on a slit of width 104 A. The image seen through the slit shall (a) be a fine sharp slit white in colour at the center.
(a) be a fine sharp slit white in colour at the center.
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Consider sunlight incident on a pinhole of width 10^3A. The image of the pinhole seen on a screen shall be
(b), (d) (b) different from a geometrical image. (d) diffused coloured region around a sharp central white spot.
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A rectangular path of 60m length and 3m width is covered by square tiles of side 25cm. How many tiles will there be in one row along its width?
12, 240, 2880
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A rectangular sheet of paper is of length 1.2m and width 21cm. Find the ratio of width of the paper to its length.
The correct answer is 7 : 40
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A ray of light is incident normally on a plane glass slab. What will be (i) the angle of refraction and (ii)
The ray of light which is incident normally on a plane glass slab passes undeviated. That is such a ray suffers no bending at the surface because here the angle...
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A monochromatic ray of light passes from air to glass. The wavelength of light in air is λ, the speed of light in air is
(a) The relation between speed of light in air c and in glass v is given by c/v = =1.5 (b) The wavelength of light in glass (λ1) μ = λ/λ1 = λ/1.5
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A ray of light is normally incident on one face of an equilateral glass prism. Answer the following:
(a) If the incident ray normal to prism then angle of incidence is 0o. (b) In this case the angle of refraction from the first face r1 = 0o. (c) As the...
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How does the intensity of scattered light depends on the wavelength of incident light?
The intensity of scattered light is found to be inversely proportional to the fourth power of wavelength of light. This relation holds when the size of air molecules is much...
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