Question

According to the discussion in Section 34.2, light rays are reversible. Are the formulas in the table in this chapter’s Summary still valid if object and image are interchanged? What does reversibility imply with respect to the forms of the various formulas?

Short answer

All the formulas are same if the image and object are interchanged.

Step-by-step solution

Step 1:Different forms of formulas.

All the formulas are same if the image and object are interchanged. $n_a$and $n_b$must be interchanged and also $y$and $y\text{'}$in $m=\frac{y}{y\text{'}}$. Reversibility requires that the formulas be unchanged by the interchange of image and object.