Question

For a point object, which of the following always produces virtual image in air?

• A. Plano-Convex lens
• B. Convex mirror
• C. Biconvex lens
• D. Concave mirror

Answer 1

The Correct Option is B

• Plano-Convex lens: Produces real images for objects outside focal length; produces virtual images only when object is inside focal length. Thus, not always virtual. 
• Convex mirror: Always forms virtual, erect, and diminished images, irrespective of object distance. Therefore, always produces virtual images.
• Biconvex lens: Produces real images for objects beyond focal length; virtual images only when object is within focal length. Thus, not always virtual.
• Concave mirror: Can produce both real and virtual images depending on the object position. Thus, not always virtual.

Final Conclusion:
Among the given options, only a Convex mirror always produces virtual images.