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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 2 (25 MCQs)

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1. What is the angular magnification of a telescope when the final image is formed at infinity?
2. What type of image is formed by a concave mirror when the object is placed between the pole and focus?
3. Find the position of 1 cm tall object which is placed 8 cm in front of convex mirror of radius of curvature 24 cm.
4. What defect of vision is corrected by a concave lens?
5. A convergent lens will become less convergent in:
6. What is the magnification formula for a mirror?(I=height of image and O=height of object)
7. The magnification of a compound microscope is 30 and the focal length of its eye piece is 5m. Calculate the magnification produced by the objective, when the image is to be formed at least distance of distinct vision (25 cm).
8. What type of reflection occurs when light rays are reflected from a rough surface?
9. When a convex lens placed inside a transparent medium of refracting index greater than that of its own material
10. An object approaches a convergent lens from the left of the lens with uniform speed 5 m/s and stops at the focus. The image
11. What happens to the image when the lower half of a concave mirror is covered with an opaque material?
12. An object placed in front of a concave mirror of focal length 0.15 m produces a virtual image, which is twice the size of the object. The position of the object with respect to the mirror is
13. How does the refractive index of a medium relate to the speed of light in that medium?
14. What happens to the image formed by a convex mirror?
15. For the same value of angle of incidence, the angles of refraction in three media A, B and C are 15$^\circ$, 25$^\circ$ and 35$^\circ$ respectively. In which medium would the velocity of light be minimum?
16. The radii of curvatures of each of the surfaces of a convex lens (refractive index of the material is 1.5) is 20 cm. The focal length of the lens in air is
17. A thin equiconvex glass lens of refractive index 1.5 has power of 5D. When the lens is immersed in a liquid of refractive index $\mu$, it acts as a divergent lens of focal length 100 cm. The value of $\mu$ of liquid is .....
18. Which of the following is possible application of fibre optics?
19. A person looks into a concave mirror and sees a larger image of themselves. What can we infer about the position of the object relative to the focal point of the mirror?
20. If the critical angle for total internal reflection from a medium to vacuum is 30$^{o}$, the velocity of light in the medium is
21. Two lenses of focal lengths 20 cm and-40 cm are held in contact. The image of an object at infinity will be formed by the combination at
22. What is the critical angle for total internal reflection?
23. What type of aberration causes blurring of images due to rays not focusing at a single point?
24. A microscope has an objective of 5mm focal length and eye piece of 30 mm focal length and the distance between them is 150 mm. The magnification is:
25. When a ray of light goes from a rarer medium into a denser medium, then:
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