1)

Assuming  human pupil to have radius of 0.25cm and a comfortable viewing distance of 25cm , the minimum separation between  two objects  that human eye can resolve at 500 nm wavelength is


A) 1μm

B) 30μm

C) 100μm

D) 300μm

Answer:

Option B

Explanation:

 We can write receiving  angle of nacked eye as

2622021414_m37.JPG

θ=1.22λD

  Where, D is the diameter of eye lens.

    or    Y25×102=1.22×500×1090.25×2×102

                  Y=30×106m=30μm