Ray and Wave Optics Test Online MCQs

1. When a ray of light enters a glass slab, then

2. Light of wavelength 6000 Å id reflected at nearly normal incidence from a soap films of refractive index 1.4. the least thickness of the film that will appear black is:

3. Sky appears to be blue in clear atmosphere due to which property of light:

4. Light of wavelength 589.3 nm is incident normally on a slit of width 0.01 m. The angular width of the central diffraction maximum at a distance of 1 m from the slit, is:

5. Interference occurs in which of the following waves?

6. In an electron microscope the accelerating voltage is increased from 20 kV to 80 kV, the resolving power of the microscope will become

7. The Cauchy’s dispersion formula is

8. Four lenses having the focal length of + 15 cm, 20 cm, +150 cm, and +250 cm respectively are provided to make an astronomical telescope. The image is virtual, then the position of the object will be:

9. Two waves of intensities I and 4I superimposes. Then the maximum and minimum intensities are:

10. If the luminous intensity of a unidirectional bulb is 100 candela then total luminous flux emitted from the bulb is:

11. If a star is moving towards earth then the spectrum lines are shifted towards:

12. What change occurs, if the monochromatic light used in Young’s double slit experiment is replaced by white light?

13. Mirage is a phenomenon due to

14. How can be chromatic aberration be corrected

15. The critical angle for the material of a prism is 45° and its refracting angle is 30°. A monochromatic ray goes out perpendicular to the surface of emergence from the prism. Then the angle of incidence on the prism will be: