1) 1. The refractive index of a liquid using a concave mirror is found by comparing: a) A. Two radii of curvature b) B. Two focal lengths c) C. Two incident angles d) D. Two object distances 2) 2. When liquid is poured into a concave mirror, the focus: a) A. Moves downward b) B. Moves upward c) C. Disappears d) D. Remains unchanged 3) 3. The formula for refractive index of the liquid is: a) A. μ = f′/f b) B. μ = f²/f′ c) C. μ = f/f′ d) D. μ = f + f′ 4) 4. The image used in this experiment is: a) A. Virtual b) B. Real c) C. Inverted d) D. Both B and C 5) 5. The upward shift of the image is due to: a) A. Reflection b) B. Diffraction c) C. Refraction d) D. Interference 6) 6. The index pin is adjusted until: a) A. It touches the mirror b) B. It becomes brightest c) C. There is no parallax d) D. Its shadow disappears 7) 7. A concave mirror forms a real focus because it a) A. Diverges rays b) B. Converges rays c) C. Transmits rays d) D. Blocks rays 8) 8. Apparent focal length f′ is: a) A. Greater than f b) B. Less than f c) C. Equal to f d) D. Zero 9) 9. The liquid layer used is: a) A. Thick b) B. Thin c) C. Frothy d) D. Gel-like 10) 10. Refractive index tells how much: a) A. Time light takes b) B. Light bends c) C. Light reflects d) D. Mirror shines

JKC 11 physics EXPERIMENT No2. R.I. Of A Liquid By Concave Mirror

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