Question

Could you explain how to figure out what lens or mirror is used from these two principal rays?

5. A mirror or lens is placed at the location of the gray box. The solid black indicates the optical axis. The dashed vertical line is the location of the optical device. Each box represents 1.00 cm. Two principal rays from the tip of the object are shown. → a. Which type of optical device is used here? i. Concave mirror ii. Convex mirror iii. Converging lens iv. Diverging lens

Answer 1

5.) The ongoing upper principal ray converges from its initial path and also ray gets refracted through optical device which means its a lens not a mirror. Thus the optical device is converging lens i.e. convex lens.
option-iii is correct

6.) The ongoing upper principal ray diverges from its initial path which indicates that optical device is diverging one. Also the ray gets transmitted through the optical device which shows that the optical device is not a mirror. Hence we have a diverging lens as the optical device i.e. Concave lens.

option-iv is corr