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) 10 W/m² (c) 108W/m² (d) 10²W/m²
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) 10 W/m² (c) 108W/m² (d) 10²W/m²
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Transcribed Image Text: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
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