An object is placed 30 cm from a concave lens of focal length 15 cm. What is the

Practice Questions

Q1
An object is placed 30 cm from a concave lens of focal length 15 cm. What is the nature of the image formed?
  1. Real and inverted
  2. Virtual and erect
  3. Real and erect
  4. Virtual and inverted

Questions & Step-by-Step Solutions

An object is placed 30 cm from a concave lens of focal length 15 cm. What is the nature of the image formed?
  • Step 1: Identify the type of lens. In this case, it is a concave lens.
  • Step 2: Note the distance of the object from the lens, which is 30 cm.
  • Step 3: Understand the focal length of the lens, which is -15 cm (concave lenses have a negative focal length).
  • Step 4: Recall that for a concave lens, the image formed is always virtual and erect when the object is placed in front of it.
  • Step 5: Conclude that since the object is in front of the concave lens, the image will be virtual and erect.
  • Lens Formula – Understanding the relationship between object distance, image distance, and focal length for lenses.
  • Image Characteristics – Identifying the nature (real/virtual) and orientation (erect/inverted) of images formed by concave lenses.
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