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Asked by Dr Susitha T Last Modified
Answer 
Dr Rashmi Raheja
Medical Educator (MBBS, MD) with 6 yrs of teaching experience
It is just to avoid the refraction at the air-glass interface. Cedarwood oil has a similar refractive index, i.e. 1.5, as that of the glass coverslip, so there will be no refraction of rays when light passes from object to objective lens.
(R.I. of glass coverslip is 1.5,
R.I. of cedarwood oil is also 1.5
But R.l. of air is 1)
Cedarwood oil is used for the following reasons:
I hope it helps.
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