Light travelling through a small pinhole usually does not...
Light travelling through a small pinhole usually does not make a shadow with a distinct sharp edge because of
diffraction
interference
reflection
refraction
Correct answer is A
No explanation has been provided for this answer.
A cell of internal resistance 2 π supplies current to a 6 π resistor. The efficiency of the ce...
Which of the following is a secondary colour ...
An explosion occurs at an altitude of 312 m above the ground. If the air temperature is -10.00°C...
The Earth's magnetic equator passes through Jos in Nigeria. At Jos. the ...
The main function of the commutator in a simple d.c. motor is to ...