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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 6 (25 MCQs)

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1. A glass concave lens is placed in a liquid in which it behaves like a convergent lens. The refractive index of glass is
2. A ray of light can suffer total internal reflection when it goes from:
3. How does the magnifying power of a telescope change on increasing the linear diameter of its objective?
4. A concave lens has a focal length of-10 cm. If an object is placed 15 cm from the lens, what is the position of the image formed?
5. What is the effect of temperature on the critical angle?
6. When a beam of light is incident on a plane mirror, it is found that a real image is formed. The incident beam must be
7. What is the effect of scattering on the color of the sky?
8. An object is placed at a distance of f/2 from a convex lens. The image will be
9. Which of the following colour of white light deviated most when passes through a prism?
10. A convex lens of refractive index 3/2 has a power of 2.5 D in air. If it is placed in a liquid of refractive index 2 then the new power of the lens is
11. An object is placed symmetrically between two plane mirrors, inclined at an angle of 72$^\circ$, then the total number of images observed is
12. What is the relationship between the angles of incidence and refraction at the interface of two media?
13. A tank is filled with water to a height of 12.5cm. The apparent depth of a needle lying at bottom of tank is measured by a microscope to be 9.4cm. What is the refractive index of water?
14. The deviation of a ray on passing through a prism is ($\mu$-1)A FOR
15. A person 1.6 m tall is standing at the centre between two walls three metre high. What is the minimum size of a plane mirror fixed on the wall in front of him, if he is to see the full height of the wall behind him?
16. In a glass prism:
17. The angle of minimum deviation for a hollow prism filled with a liquid is 30 degree. A ray of light falling on the prism is refracted at 30 degree. The refractive index of the liquid is:
18. Two convex lenses of focal lengths 0.3 m and 0.05 m are used to make a telescope. The distance kept between them is equal to:
19. What is the angle of incidence equal to when light reflects off a smooth surface?
20. What type of image does a convex mirror always form?
21. While measuring refractive index of glass using a glass slab of thickness 3 cm and a travelling microscope a student observes that he needed to shift the microscope by 1 cm to refocus the mark on the base of the travelling microscope when the slab is kept on it. The refractive index of the material of the glass slab is
22. What is the power of a lens with a focal length of 50 cm?
23. In a compound microscope, what type of image does the objective lens produce?
24. Focal Length of a Lens Combination When lenses are separated by a distance d
25. Due to refraction, the depth of an optically denser medium appears to be
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