Question

An object is placed infront of a concave lens between the optical centre and the focus. The image is:
1. Real, diminished
2. Real, enlarged
3. Virtual, diminished
4. Virtual, enlarged

Answer 1

Correct Answer - Option 3 : Virtual, diminished

The correct answer is option 3) i.e. Virtual, diminished

CONCEPT:

• Concave lens: It is a diverging lens that diverges the parallel beam of light.
  • It can also gather light from all directions and project it as a parallel beam.
  • The focal length of the concave lens is negative.
  • It has a virtual focus from the diverging rays of light that seem to converge.

• Images formed by concave lenses:
  • Images are always smaller than the object, erect, and virtual.
  • As the distance between the object and the lens decreases, the size of the virtual image increases as the distance between the virtual image and the mirror decreases.

​EXPLANATION:

• When an object is placed between the optical centre and focus, it will be at the maximum possible nearest to the lens.
• Therefore, the object will produce an image that is smaller in size than object itself.
• Hence, an object is placed in front of a concave lens between the optical centre and the focus produces virtual and diminished images.