Question

draw sign convention of concave and convex lens​

Answer 1

Explanation:

According to the sign convention, a convex lens focal length is positive, whereas a concave lens focal length is negative. The incident light always moves from left to right because the object is always on the lens's left side.

Answer 2

Answer:

• Focal length of Convex Lens is positive.
• Focal length of Concave Lens is negative.
• Since object is always in front of the lens, object distance is always negative.
• If a real image is formed, image is formed on right side, so image distance is positive.