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WAEC Physics 2022 Paper

Question : 42

Total: 50

The refracted angle is less than the incident angle if the speed is higher in the first material
Its wavelength does not change
It bends away from the normal if the speed is lower in the first material
Its frequency changes.

Solution:

Concept:

During refraction, the speed and wavelength of light change, but its frequency remains unchanged.

Explanation:

When light slows down while entering a medium, it bends towards the normal, making the refracted angle smaller than the incident angle.

When light speeds up while entering a medium, it bends away from the normal.

Therefore, option A and option C are correct statements.

The frequency of light never changes during refraction, so option D is not correct.

Also, since

v = f\lambda

and

f

remains constant, the wavelength must change when the speed of light changes.

So the statement that its wavelength does not change is also incorrect.

Answer:

The statements that are not correct are options B and D.

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