NEET Physics: Wave Optics — Practice Set 1 (15 MCQs)

NEET Physics: Wave Optics — Practice Set 1

Q1. What is the intensity of light transmitted through two polaroids with their pass-axes at \( 45^\circ \) to each other, if the initial intensity after the first polaroid is \( I_0 \)?

A. \( I_0 \)
B. \( \frac{I_0}{2} \)
C. \( \frac{I_0}{4} \)
D. \( 0 \)

Q2. What is the amplitude of the resultant wave when two coherent waves of amplitude \( a \) interfere with a phase difference of \( \pi/2 \)?

A. \( 2a \)
B. \( a \)
C. \( 0 \)
D. \( a\sqrt{2} \)

Q3. What is the path difference for the seventh bright fringe in a double-slit experiment?

A. \( 6\lambda \)
B. \( 7\lambda \)
C. \( \frac{13\lambda}{2} \)
D. \( 5\lambda \)

Q4. Why does total internal reflection occur only when light travels from a denser to a rarer medium?

A. Light’s amplitude increases
B. Wavelength doubles
C. Critical angle exists in denser medium
D. Frequency changes

Q5. What prevents the formation of an interference pattern when two independent light sources are used?

A. Different amplitudes
B. Lack of coherence
C. Unequal wavelengths
D. Speed variation

Q6. What is the nature of the interference pattern formed by incoherent sources?

A. Bright and dark fringes
B. Only bright fringes
C. Only dark fringes
D. Uniform illumination

Q7. What determines the visibility of interference fringes when light passes through two slits?

A. Amplitude equality
B. Wavelength variation
C. Constant phase difference
D. Speed uniformity

Q8. In a single-slit diffraction pattern, what happens to the central maximum’s width if the slit width is tripled?

A. Triples
B. Doubles
C. Remains the same
D. Reduces to one-third

Q9. What happens to the central maximum’s width in a single-slit diffraction pattern if the slit width is reduced to half?

A. Halves
B. Remains the same
C. Triples
D. Doubles

Q10. What distinguishes the interference pattern of a double-slit experiment from the diffraction pattern of a single slit?

A. Different frequencies
B. Amplitude variation
C. Number of sources
D. Wavelength change

Q11. What is the frequency of light with a wavelength of \( 480 \, \text{nm} \) in air, given the speed of light in air is \( 3.0 \times 10^8 \, \text{m/s} \)?

A. \( 5.0 \times 10^{14} \, \text{Hz} \)
B. \( 6.25 \times 10^{14} \, \text{Hz} \)
C. \( 7.0 \times 10^{14} \, \text{Hz} \)
D. \( 4.0 \times 10^{14} \, \text{Hz} \)

Q12. What is the refractive index of a medium if the speed of light in it is \( 2.25 \times 10^8 \, \text{m/s} \) and in vacuum is \( 3.0 \times 10^8 \, \text{m/s} \)?

A. 1.5
B. 1.25
C. 1.33
D. 1.6

Q13. What is the shape of the wavefront emitted by a point source at a large distance?

A. Plane
B. Spherical
C. Cylindrical
D. Elliptical

Q14. What fundamental principle allows the prediction of a new wavefront’s shape from a known wavefront using secondary wavelets?

A. Superposition
B. Conservation of energy
C. Huygens’ principle
D. Malus’ law

Q15. What is the distance of the fifth dark fringe from the central maximum in a double-slit experiment if \( \lambda = 650 \, \text{nm} \), \( d = 0.5 \, \text{mm} \), and \( D = 1.0 \, \text{m} \)?

A. 5.2 mm
B. 6.5 mm
C. 5.85 mm
D. 7.8 mm

Physics — Wave Optics

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What is the intensity of light transmitted through two polaroids with their pass-axes at \( 45^\circ \) to each other, if the initial intensity after the first polaroid is \( I_0 \)?

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