Question

list the sign convention of concave and convex lens

Answer 1

Answer:

Explanation:concave lens :-f= -ve

v=-ve

Convex lens:- f= +ve

v= +ve

Answer 2

The sign convention of concave and convex lens:

• The sign convention of concave len is negative.
• The sign convention of convex len is positive.
• In case refraction through a lens if, we take the left-hand side to be positive and right-hand side to be negative, then focal length of the second surface of the lens that is $F_{2}$ is used to determine sign.
• For the convex lens, $F_{2}$ lies in the positive quadrant whereas, in case on concave lens the focus of the second surface lies to the right which is in the negative quadrant.
• Hence, the sign convention is negative.