Physics WAEC

A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block; calculates the refractive index of the material of the block.

A. 2/5
B. 3/5
C. 3/2
D. 5/3
E. 5/2

Correct Answer:

Option D – 5/3

SEE ALSO An electric heater has a resistance of 50Ω. When it is immersed in water and connected to the mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings
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