Question

You have two lens is a and b of focal length + 10 cm and - 10 cm respectively state the nature and power of two lens respectively. which of the two lenses will form a virtual and magnified image of an object placed at 8 cm from the lens draw ray diagram to justify your answer

Answer 1

Answer:

lens a = convex

lens b = concave

power of a = +10 D

power of b = -10 D

Explanation:

since power = 100/f

lens a will form virtual and enlarged image as object is placed between focal and the pole. as shown in fig.