Question

The test tube filled with oil becomes nearly invisible because​

Answer 1

Answer:

The Pyrex® glass seems to disappear because the glass and vegetable oil have about the same index of refraction, so the light does not bend as it passes from one substance to the other. ... The Pyrex® glass has the same angle of refraction as the vegetable oil, so the light bends at the same angle

Answer 2

Answer:

Hola...

Here is your answer mate __________☺️

Explanation:

When oil is filled in the test tube at the second surface to the test tube again refractive index changes only slightly and most of the light gets transmitted hence we are not able to see clearly.

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