1. Optical active crystals rotates the
A. Vibrating plane
B. Polarization plane
C. Diffraction plane
D. Interference plane
✅ The correct answer is option B.
Physical Optics MCQs
2. Which is not optically active?
A. Sugar
B. Tartaric acid
C. Water
D. Sodium chlorate
✅ The correct answer is option C.
3. In a double slit experiment, we observe
A. Interference fringes only
B. Diffraction fringes only
C. Both interference and diffraction fringes
D. Polarized fringes
✅ The correct answer is option C.
4. When light incident normally on thin film the path difference depends upon
A. The thickness of the film only
B. Nature of the film only
C. The angle of incidence only
D. All thickness nature and angle of incidence
✅ The correct answer is option D.
5. Which one of the following properties of light does not change with the nature of the medium?
A. Velocity
B. Wavelength
C. Amplitude
D. Frequency
✅ The correct answer is option D.
6. Light reaches the earth from the sun in nearly
A. 15 minutes
B. 10 minutes
C. 8 minutes
D. 8 minutes 30 seconds
✅ The correct answer is option D.
7. The photoelectric effect was given by
A. Hertz
B. Fresnel
C. Einstein
D. Plank
✅ The correct answer is option C.
8. According to Einstein light travels from one place to another in the form of
A. Waves
B. Particles
C. Photons
D. It was not his discovery
✅ The correct answer is option C.
9. Longitudinal waves do not exhibit
A. Reflection
B. Refraction
C. Diffraction
D. Polarization
✅ The correct answer is option D.
10. Central spot of Newtons rings
A. Bright
B. Dark for large wavelength
C. Dark
D. Bright for large wavelength
✅ The correct answer is option A.