Question

Irrespective of the position of the object on the principal axis, a concave lens always forms an image of nature

• A. real, invert
• B. real, erect
• C. virtual, erect
• D. Does not form any image

Answer 1

The Correct Option is C

To understand why a concave lens always forms a certain type of image irrespective of the object's position, let's explore how concave lenses work. A concave lens, also known as a diverging lens, has a surface that curves inward. This shape causes light rays that pass through the lens to spread out or diverge. When parallel light rays (coming from an object) strike a concave lens, they refract and diverge away from the principal axis.

To analyze the image formation, we utilize ray diagrams:

• Ray 1: A ray parallel to the principal axis refracts through the lens and appears to diverge from the focal point on the same side.
• Ray 2: A ray passing through the optical center of the lens goes undeviated.

These rays never actually meet on the opposite side of the lens. Instead, they appear to originate from a point on the same side as the object. Consequently, the image is formed where the rays appear to diverge, meaning:

• Nature of Image: The image formed is virtual because it cannot be projected on a screen.
• Orientation of Image: The image is erect as it preserves the orientation of the object.

Therefore, irrespective of the object's position on the principal axis, a concave lens always forms an image that is virtual and erect.

Answer 2

A concave lens always forms a virtual and erect image irrespective of the object's position on the principal axis.

Key characteristics of image formed by a concave lens:

• Virtual – image cannot be captured on a screen
• Erect – image is upright
• Diminished – image is smaller in size

This happens because the concave lens diverges the rays, and the image appears to be formed on the same side as the object.

Final Answer: virtual, erect