Q1. What property of light waves causes the bending of rays around corners in a diffraction experiment?
A. Wave nature
B. High speed
C. Constant frequency
D. Polarization
Q2. What is the frequency of light with a wavelength of \( 630 \, \text{nm} \) in air, given the speed of light in air is \( 3.0 \times 10^8 \, \text{m/s} \)?
A. \( 5.56 \times 10^{14} \, \text{Hz} \)
B. \( 4.76 \times 10^{14} \, \text{Hz} \)
C. \( 5.0 \times 10^{14} \, \text{Hz} \)
D. \( 6.25 \times 10^{14} \, \text{Hz} \)
Q3. What is the speed of light in a medium with refractive index 1.6, given the speed in vacuum is \( 3.0 \times 10^8 \, \text{m/s} \)?
A. \( 1.875 \times 10^8 \, \text{m/s} \)
B. \( 2.31 \times 10^8 \, \text{m/s} \)
C. \( 1.5 \times 10^8 \, \text{m/s} \)
D. \( 2.07 \times 10^8 \, \text{m/s} \)
Q4. Why does the intensity of light transmitted through three polaroids reach a maximum when the middle one is at 45° to the crossed first and third polaroids?
A. Frequency alignment
B. Wavelength matching
C. Amplitude doubling
D. Maximum projection of polarization
Q5. What ensures that a convex lens can focus light from a plane wave into a single point?
A. Differential delay across the lens
B. Increase in light speed
C. Uniform amplitude
D. Change in frequency
Q6. What is the intensity of light after passing through two polaroids with pass-axes at \( 60^\circ \), if the initial unpolarized intensity is \( I_0 \)?
A. \( \frac{I_0}{4} \)
B. \( \frac{I_0}{8} \)
C. \( \frac{I_0}{2} \)
D. \( 0 \)
Q7. What is the speed of light in a medium with refractive index 1.3, given the speed in vacuum is \( 3.0 \times 10^8 \, \text{m/s} \)?
A. \( 2.31 \times 10^8 \, \text{m/s} \)
B. \( 2.07 \times 10^8 \, \text{m/s} \)
C. \( 1.5 \times 10^8 \, \text{m/s} \)
D. \( 3.0 \times 10^8 \, \text{m/s} \)
Q8. What is the effect on the energy of a light wave when its speed decreases in a denser medium?
A. Remains unchanged
B. Decreases
C. Increases
D. Becomes zero
Q9. What is the shape of the wavefront after a plane wave reflects off a plane mirror?
A. Spherical
B. Cylindrical
C. Tilted
D. Plane
Q10. What is the angular position of the fourth minimum in a single-slit diffraction pattern if the slit width is \( 5.0 \, \mu\text{m} \) and the wavelength is \( 500 \, \text{nm} \)?
A. 17.5°
B. 20°
C. 23.6°
D. 13.9°
Q11. What is the intensity of light after passing through two polaroids with their pass-axes perpendicular to each other, if the initial intensity is \( I_0 \)?
A. \( \frac{I_0}{2} \)
B. \( 0 \)
C. \( \frac{I_0}{4} \)
D. \( I_0 \)
Q12. What happens to the frequency of light when it refracts from air into water?
A. Remains the same
B. Increases
C. Decreases
D. Doubles
Q13. In a single-slit diffraction pattern, what happens to the intensity of secondary maxima as their order increases?
A. Increases
B. Remains the same
C. Becomes zero
D. Decreases
Q14. What is the distance of the sixth bright fringe from the central maximum in a double-slit experiment if \( \lambda = 470 \, \text{nm} \), \( d = 0.4 \, \text{mm} \), and \( D = 2.0 \, \text{m} \)?
A. 14.1 mm
B. 11.75 mm
C. 9.4 mm
D. 16.45 mm
Q15. When a plane wave reflects off a plane surface, what is the relationship between the angle of incidence and the angle of reflection?
A. Angle of incidence = Angle of reflection
B. Angle of incidence > Angle of reflection
C. Angle of incidence < Angle of reflection
D. Angle of reflection = 90°
Physics — Wave Optics
Set 2 of 22
22:30
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