Why is cedarwood oil placed over the specimen while using oil immersion objectives?

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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...
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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) read less
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Cedarwood oil is used for the following reasons: Same refractive index as glass Makes continuous column with slide and objective lens to reduce the loss of light by refraction and provides more light for 100 x objective lens whose aperture is tiny. The viscosity and stickiness of cedarwood oil make...
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Cedarwood oil is used for the following reasons: Same refractive index as glass Makes continuous column with slide and objective lens to reduce the loss of light by refraction and provides more light for 100 x objective lens whose aperture is tiny. The viscosity and stickiness of cedarwood oil make it ideal to use with an oil immersion lens to create a continuous column; otherwise, even coconut oil could be used, but it will spread over the slide rather than making a viscous drop. I hope it helps. read less
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To get a clear image because oil prevents light from bending and distorting the image of an object under study.
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I am P V Rao, an experienced Educator, Teacher and Tutor, with 40 years of experience.

Cedarwood oil has insecticidal and antifungal properties. It has the same R.I. likes glass, i.e., 1.5.
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Cedarwood oil is placed over the specimen to avoid refraction at the air-glass interface. Cedarwood oil has a similar refractive index, i.e. 1.5, as the glass coverslip to prevent light from bending and distortion of the image.
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