NEETprep Bank NEET Physics Wave Optics Questions Solved


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(4)

Initial resolving power =2μSinθ1.22λ (μSinθ=numerical aperture)Final resolving power=2×2μSinθ1.22λ2=4μSinθ1.22λ=4×initial resolving power

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Two coherent sources of light can be obtained by

(1) Two different lamps

(2) Two different lamps but of the same power

(3) Two different lamps of same power and having the same colour

(4) None of the above

(4) The coherent source cannot be obtained from two different light sources.

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By Huygen's wave theory of light, we cannot explain the phenomenon of 

(1) Interference

(2) Diffraction

(3) Photoelectric effect

(4) Polarisation

(3) Huygen's wave theory fails to explain the particle nature of light (i.e. photoelectric effect)

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Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are 

(1) 5I and I

(2) 5I and 3I

(3) 9I and I

(4) 9I and 3I

(3) Imax=(I1+I2)2=(I+4I)2=9I

Imin=(I1I2)2=(I4I)2=I

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