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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/m²

A 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 pupil of an eagle's eye has a diameter of 6.0 mm. Two field mice are separated by 0.010 m. From a distance of 201 m, the eagle sees them as one unresolved object and dives toward them at a speed of 16 m/s. Assume that the eagle's eye detects light that has a wavelength of 550 nm in vacuum. How much time passes until the eagle sees the mice as separate objects? t = i

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How thick is a layer of oil floating on a 52cm bucket of water. You measure your laser beam to take 2.33 ns going straight through the layers

A light beam has a frequency of 660 MHz in a material of refractive index 2.00. In another material of refractive index 3.00, its frequency will be   A. 440 MHz   B. 330 MHz   C. 660 MHz   D. 1320 MHz   E. 990 MHz