a glass rod of refractive index 1.42 is immersed in kerosene of refractive index 1.42 . the rod will be :

a) become visible

b) appear bent

c) appear raised in the liquid

d) appear as a plate

e) none of these

and WHY ?????

When a glass rod of refractive index 1.42 is immersed in kerosene of refractive index 1.42, the rod will be invisible. 
Transmittance is the incident light that passes through the medium at specific wavelength. Since the rod and kerosene oil have the same refractive index, the rod will be invisible inside the oil. 
 

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sorry

a) become invisible

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