NCERT Class 12 MCQ Quiz Hub

MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments

Choose a topic to test your knowledge and improve your NCERT Class 12 skills

1. Which of-the following is not a property of light?




2. Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be:




3. The phase difference between the electric and the magnetic field vectors in electromagnetic waves is




4. A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is :




5. Which of the following cannot be polarised?




6. If a mirror is approaching you at a speed of 10 ms^1, the speed with which your image approach you is:




7. The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to w ater is:




8. The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:




9. A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface:




10. A convergent lens will become less convergent in :




11. A thin glass (RI = 32) lens has optical power of – 5D in air. Its optical power in a liquid medium with RI = 1.6 will be:




12. On reflection from a denser medium, a light wave suffers a phase difference of:




13. The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:




14. When light travels from one medium to another, which of the following does not change?




15. Two lens of power -15 D and +5 D are placed in contact co-axially. The focal length of equivalent lens is:




16. The air bubble inside water shine due to:




17. When a ray of light (white) enters a lens, undergoes a change is:




18. Radio waves from an antenna travel with the velocity of:




19. A point object is placed at the centre of a glass sphere of radius 6 cm 3 and RI = 32. The distance of virtual image from the surface of the sphere is :




20. The RI. of the material of a prism is √2 and its refracting angle is 30°. One of the refracting surface of the prism is made a mirror. A beam of monochromatic light entering the prism from the other face retraces its path, after reflection from mirror surface. The angle of incidence on prism is:




21. A telescope has an objective lens of 10 cm diameter and is situated at a distance of 1 km from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when seen in the light of mean λ = 5000 A is of the order of:




22. When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is :




23. A convex lens is dipped in a liquid, whose R.I. is equal to that of R.I. of material of the lens. Then its focal length will:




24. Which of the following is not essential for the formation of a pure spectrum?




25. A certain far-sighted person cannot see objects closer to the eye than 100 cm. The power of the lens which will enable him to read at a distance of 25 cm will be?




26. Which produces additional luminiscence in a fluorescent tube?




27. ar point of a myopic eye is 40 cm. The dioptic power of a corrective lens is:




28. Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact. The effective power of the combination is:




29. A blue cross on the white background is illuminated with white light and is observed through red filter. What is seen?




30. The angle of deviation for a prism is greatest for:




31. A double convex air bubble in water behaves as: