GEOMETRICAL OPTICS
1. Which of the following is not a type of lens?
- a) Convex lens
- b) Concave lens
- c) Cylindrical lens
- d) Plane lens
2. A lens with both surfaces curved outwards is called:
- a) Convex lens
- b) Concave lens
- c) Plano-convex lens
- d) Biconcave lens
3. Which type of lens can converge parallel rays of light to a point?
- a) Convex lens
- b) Concave lens
- c) Cylindrical lens
- d) Plane lens
4. In a diverging lens, the center is:
- a) Thicker than the edges
- b) Thinner than the edges
- c) The same thickness as the edges
- d) Not defined for a diverging lens
5. Lenses with two surfaces that are curved but have different radii of curvature are called:
- a) Convex lenses
- b) Concave lenses
- c) Meniscus lenses
- d) Plano-concave lenses
6. A lens that has one surface convex and the other surface concave is called:
- a) Convex lens
- b) Concave lens
- c) Plano-convex lens
- d) Meniscus lens
7. The lens used in a magnifying glass is generally a:
- a) Convex lens
- b) Concave lens
- c) Biconvex lens
- d) Plano-concave lens
8. Which of the following lenses can only form virtual images?
- a) Convex lens
- b) Concave lens
- c) Plano-convex lens
- d) Biconcave lens
9. The lens used in a camera to form real images is typically a:
- a) Convex lens
- b) Concave lens
- c) Plano-convex lens
- d) Biconcave lens
10. A lens that can correct chromatic aberration is known as a:
- a) Achromatic lens
- b) Spherical lens
- c) Cylindrical lens
- d) Plano-convex lens
11. The lens used in a projector to form an enlarged image on a screen is usually a:
- a) Convex lens
- b) Concave lens
- c) Biconvex lens
- d) Plano-concave lens
12. Which type of lens is used to correct nearsightedness?
- a) Convex lens
- b) Concave lens
- c) Plano-convex lens
- d) Biconcave lens
13. The bending of light rays as they pass through a lens is known as:
- a) Refraction
- b) Reflection
- c) Diffraction
- d) Dispersion
14. A lens that causes light rays to spread out is called a:
- a) Diverging lens
- b) Converging lens
- c) Cylindrical lens
- d) Plane lens
15. The ability of a lens to bend light is measured by its:
- a) Focal length
- b) Aperture size
- c) Lens power
- d) Aberration
16. The distance between the principal focus and the lens is known as the:
- a) Focal length
- b) Aperture size
- c) Lens power
- d) Magnification
17. The equation that relates the object distance (u), image distance (v), and focal length (f) of a thin lens is called:
- a) Snell's law
- b) The thin lens formula
- c) Newton's law of motion
- d) Ohm's law
18. The thin lens formula can be written as:
- a) 1/f = 1/v - 1/u
- b) f = v - u
- c) u = v/f
- d) v = u + f
19. In the thin lens formula, a positive focal length indicates a:
- a) Converging lens
- b) Diverging lens
- c) Plane lens
- d) Cylindrical lens
20. A lens with a focal length of +10 cm is:
- a) A converging lens
- b) A diverging lens
- c) A plane lens
- d) A cylindrical lens
21. When an object is placed at the focal point of a converging lens, the image formed is:
- a) Real and inverted
- b) Virtual and upright
- c) Real and upright
- d) Virtual and inverted
22. The magnification produced by a lens is given by the formula:
- a) M = v/u
- b) M = u/v
- c) M = f/v
- d) M = f/u
23. The magnification produced by a lens with a focal length of +20 cm when an object is placed 30 cm from the lens is:
- a) +0.67
- b) -0.67
- c) +1.50
- d) -1.50
24. A magnifying glass typically uses a lens with a focal length of:
- a) +10 cm
- b) -10 cm
- c) +20 cm
- d) -20 cm
25. The power of a lens is measured in:
- a) Diopters
- b) Meters
- c) Watts
- d) Newtons
26. The power of a lens can be calculated using the formula:
- a) P = 1/f
- b) P = f/u
- c) P = u/f
- d) P = f/v
27. A lens with a power of +2 diopters is:
- a) A converging lens
- b) A diverging lens
- c) A plane lens
- d) A cylindrical lens
28. When two thin lenses are placed in contact, the combined focal length is given by the formula:
- a) 1/f = 1/f1 + 1/f2
- b) f = f1 + f2
- c) f = f1 - f2
- d) f = f1/f2
29. When a converging lens and a diverging lens are placed in contact, the combination is called a:
- a) Telescope
- b) Microscope
- c) Compound lens
- d) Cylindrical lens
30. In a compound microscope, the lens closer to the object being viewed is called the:
- a) Objective lens
- b) Eyepiece lens
- c) Condenser lens
- d) Cylindrical lens
31. A compound microscope uses a combination of lenses to:
- a) Magnify small objects
- b) Reduce aberrations
- c) Correct for chromatic aberration
- d) Form a real image
32. The eyepiece lens in a compound microscope is responsible for:
- a) Magnifying the image formed by the objective lens
- b) Collecting and focusing light onto the object
- c) Correcting for chromatic aberration
- d) Adjusting the focal length of the microscope
33. A telescope is an optical instrument used to:
- a) Observe distant objects
- b) Observe microscopic objects
- c) Measure angles accurately
- d) Transmit radio signals
34. The Galilean telescope uses a combination of lenses to produce a:
- a) Virtual and upright image
- b) Real and inverted image
- c) Real and upright image
- d) Virtual and inverted image
35. A terrestrial telescope is designed specifically for:
- a) Viewing objects on land
- b) Viewing objects in space
- c) Viewing microscopic objects
- d) Viewing underwater objects
36. A spectrometer is an instrument used to:
- a) Analyze the properties of light
- b) Measure distances accurately
- c) Observe microscopic objects
- d) Measure the temperature of objects
37. The human eye is an example of a:
- a) Diverging lens
- b) Converging lens
- c) Compound lens
- d) Cylindrical lens
38. The lens of the human eye changes its shape to focus on objects at different distances. This process is known as:
- a) Accommodation
- b) Refraction
- c) Diffraction
- d) Dispersion
39. The clear, transparent front surface of the eye is called the:
- a) Cornea
- b) Retina
- c) Iris
- d) Lens
40. The image formed on the retina of the eye is:
- a) Real and inverted
- b) Virtual and upright
- c) Real and upright
- d) Virtual and inverted
ANSWER KEY:
- d) Plane lens
- a) Convex lens
- a) Convex lens
- b) Thinner than the edges
- c) Meniscus lenses
- a) Convex lens
- a) Convex lens
- b) Concave lens
- a) Convex lens
- a) Achromatic lens
- a) Convex lens
- b) Concave lens
- a) Refraction
- a) Diverging lens
- c) Lens power
- a) Focal length
- a) Snell's law
- a) 1/f = 1/v - 1/u
- a) Converging lens
- a) A converging lens
- b) Virtual and upright
- a) M = v/u
- a) +0.67
- a) +10 cm
- a) Diopters
- a) P = 1/f
- a) A converging lens
- a) 1/f = 1/f1 + 1/f2
- c) Compound lens
- a) Objective lens
- a) Magnify small objects
- a) Magnifying the image formed by the objective lens
- a) Observe distant objects
- a) Virtual and upright image
- a) Viewing objects on land
- a) Analyze the properties of light
- b) Converging lens
- a) Accommodation
- a) Cornea
- c) Real and upright
