MHT CET · Physics · Electromagnetic Induction
When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of
- A interference
- B diffraction
- C dispersion
- D polarisation
Answer & Solution
Correct Answer
(A) interference
Step-by-step Solution
Detailed explanation
When a thin film of oil spreads over the surface of water and it is seen in broad-day light, brilliant colours are seen. These colours arise due to interference of sun-light reflected from the upper and lower surfaces of the film.
While bending of light rays at curvatures of obstacles is called diffraction. Dispersion is splitting of white light and polarisation is the restriction of the vibrations in a transverse wave.
While bending of light rays at curvatures of obstacles is called diffraction. Dispersion is splitting of white light and polarisation is the restriction of the vibrations in a transverse wave.
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A hollow charged metal sphere has radius ' \(R\) '. If the potential difference between its surface and a point at a distance ' \(5 \mathrm{R}\) ' from the centre is V, then magnitude of electric field Intensity at a distance ' \(5 \mathrm{R}\) ' from the centre of sphere isMHT CET 2021 Easy
- Two coils P and Q are kept near each other. When no current flows through coil P and current increases in coil Q at the rate \(10 \mathrm{~A} / \mathrm{s}\), the emf in coil P is 12 mV . When coil Q carries no current and current of 1.5 A flows through coil P , the magnetic flux linked with the coil Q in mWb isMHT CET 2025 Medium
- ' n ' small water drops of same size (radius r ) fall through air with constant velocity V. They coalesce to form a big drop of radius R. The terminal velocity of the big drop isMHT CET 2025 Medium
- In biprism experiment, 21 fringes are observed in a given region using light of wavelength \(480 Å\). If light of wavelength \(560 Å\) is used, the number of fringes in the same region will beMHT CET 2021 Medium
- A current ' \(I\) ' produces a magnetic flux ' \(\phi\) ' per turn in a coil of ' \(n\) ' turns. Self-inductance of the coil is ' \(L\) '. The relation between them isMHT CET 2021 Easy
- A circular coil carrying current has radius ' \(R\) '. The distance from the centre of the coil on the axis where the magnetic induction will be \(\frac{1}{27}\) th to its value at the centre of the coil isMHT CET 2025 Medium
More PYQs from MHT CET
- If \(\mathrm{f}(x)=x \cdot \mathrm{e}^{x(1-x)}\), then \(\mathrm{f}(x)\) isMHT CET 2025 Medium
- In a triangle ABC with usual notations if, \(\cot \frac{A}{2}=\frac{b+c}{a}\), then the triangle \(A B C\) isMHT CET 2025 Medium
- What would be the absolute pressure at depth \(1 \mathrm{~km}\) below the ocean?
[Given : density of water \(=10^{3} \mathrm{~kg} / \mathrm{m}^{3}, \mathrm{~g}=10 \mathrm{~m} / \mathrm{s}^{2}, 1\) atmospheric pressure \(=\) \(\left.1 \cdot 01 \times 10^{5} \mathrm{~N} / \mathrm{m}^{2}\right]\)MHT CET 2020 Easy - A galvanometer of resistance is connected to a battery of emf with resistance in series. A full scale deflection of 20 divisions is obtained in the galvanometer. To reduce the deflection to 10 divisions, the resistance in series required isMHT CET 2016 Medium
- The value of
\(\cos \left(18^{\circ}-\mathrm{A}\right) \cdot \cos (\left.18^{\circ}+\mathrm{A}\right) \ -\cos \left(72^{\circ}-\mathrm{A}\right)\cos\) \(\left(72^{\circ}+\mathrm{A}\right) \text { is }\)MHT CET 2023 Easy - A body performs linear simple harmonic motion of amplitude 'A". At what
displacement from the mean position, the potential energy of the body is one
fourth of its total energy?MHT CET 2020 Easy