Ray and Wave Optics Test Online MCQs

1. In young’s experiment the monochromatic light is used to illuminate two slits A and B as shown in figure. Interference fringes are observed on a screen placed in front of the slits. Now a thin glass plate is placed normally in the path of beam coming from the slit A, then

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

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

4. A doctor prescribes spectacles to a patient with a combination of a convex lens of focal length 40 cm, and concave lens of focal length 25 cm then the power of spectacles will be:

5. An equilateral prism is made of a material of refractive index √3. The angle of minimum deviation for the prism is:

6. The ratio of intensities of two waves is 9 : 1. If they superimpose, the ratio of maximum to minimum intensity will be:

7. An astronomical telescope of ten fold angular magnification has a length of 44 cm. The focal length of the objective is:

8. 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:

9. A cylindrical vessel is filled with water as shown if figure. A hole should be bored so that the water comes out upto maximum distance of:

10. How does the red shift confirm that the universe is expanding?

11. If two mirrors are kept at 45° to each other and a body is placed in the middle then total number of images formed is:

12. The Cauchy’s dispersion formula is

13. How can be chromatic aberration be corrected

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

15. 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: