IBDP Physics Question Analysis Topic: Physics - Short Questions
Exam Questions:
1) A biconvex lens made of a transparent material of refractive index 1.5 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reasons.
2) To which part of the electromagnetic spectrum does a wave of frequency 5×1011Hz belong?
3) To which part of the electromagnetic spectrum does a wave of frequency 3×1013Hz belong?
4) Why do electric field lines never cross each other?
Answers:
For IBDP Physics, you should know:
1) Because the refractive index of the lens material is higher than the refractive index of the air, a biconvex lens operates as a converging lens in air. The lens's material has a refractive index of 1.5, which is higher than that of water (1.33). It will therefore function as a converging lens.
2) Such waves belong to the microwaves of the electromagnetic spectrum.
3) Such waves belong to the category of infrared radiation on the electromagnetic spectrum.
4) If electric field lines cross one another at any point, it indicates that there are two different electric field directions there, which is not possible.
Work hard for your IBDP Physics examination!
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