trometer. The spectrum is seen to contain one dark band whose centre has wavelength 5.5 x 10 cm in air. Find the refractive
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- An oil drop of volume 0.2 c.c. is dropped on the surface of a
tank of water of area 1 sq. meter. The film spreads
uniformly over the surface and white light which is incident
normally is observed through a spectrometer. The spectrum
is seen to contain one dark band whose centre has
wavelength 5.5 x 10 cm in air. Find the refractive index of. M
oil.
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- A 2mW laser beams of wavelength λ = 6×10 cm is focussed on the retina by a human eye lens of focal length f = 2.5 cm and pupil diameter 2 mm. The intensity on the retina will be of the order of (a) 10¹ W/m² (b) 106W/m² (c) 108W/m² (d) 10²W/m²A laser used in LASIK eye surgery produces 55 pulses per second. The wavelength is 220.0 nm (in air), and each pulse lasts 10.0 ps. The average power emitted by the laser is 120.0 mW and the beam diameter is 0.800 mm. How long (in centimeters) is a single pulse of the laser in air?The index of refraction of a liquid is 1.32. What is the wavelength in the liquid of a light wave with a vacuum wavelength of 622 nm?
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