The lens used in a simple microscope is :

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Bihar CET B.Ed Official Paper (Held On: 25 Jun, 2024)
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  1. Concave
  2. Convex
  3. Cylindrical
  4. None of the above

Answer (Detailed Solution Below)

Option 2 : Convex
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The correct answer is Convex.

Key Points

  • A simple microscope typically uses a convex lens to magnify small objects.
  • Convex lenses converge light rays and create an enlarged image of an object placed close to the lens.
  • The magnification power of a simple microscope depends on the focal length of the convex lens.
  • Convex lenses are commonly used in magnifying glasses and simple microscopes due to their ability to produce a virtual, magnified image when used at a suitable distance from the object.

Additional Information

  • Convex Lens: A lens that is thicker in the center than at the edges and converges light rays to a focal point.
  • Simple microscopes use a single convex lens to magnify objects, typically for viewing small details like cells or fine prints.
  • Concave lenses, on the other hand, diverge light rays and are used in devices like eyeglasses to correct nearsightedness.
  • Magnification in a simple microscope can be calculated using the formula: Magnification = 1 + (D / f), where D is the distance of distinct vision (usually 25 cm), and f is the focal length of the convex lens.
  • Cylindrical lenses are used in optical devices like corrective lenses for astigmatism, not for magnification.
  • The use of a convex lens allows us to observe objects in greater detail, making them crucial in fields like biology and inspection.

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