A lens of power 4 dioptreis being used as simple microscope. To obtain maximum angular magnification from this lens, the object should be placed at?

Dear Student,
Please find below the solution to the asked query:


Power = 4 D
P = 1/f (in metres)
4 =1/f 
f = 1/P 
f= 0.25 m
f = 25 cm

Now, 
we know that:
By the definition of angular magnifiction:M= θ'θ = aoa = least distance of clear vision = 25cm for naked eyeo = object distancealso,M = af+1or,ao=af+1ao=2525+1ao=2o =a2 = 252=12.5 cm from the lens

Hope this information will clear your doubts about (Ray optics).
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Regards
Satyendra Singh

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