As it is posible only when, when light reflects from P1 after refraction from the plate P2 of light coming from light source,
First image will form due to reflection from the right surface of P1 . As light ray is falling on P1 from 11cm so it will form image at 11 cm in left. So, distance of first image from insect is 11 + 3 = 14 cm.
Second image will form due to reflection on left surface of P1.
for left surface of P1 light seems to coming from the distance 33/2+ 3 cm.
So, light seems to coming from 45/2 cm from right surfaces of P1
So, final position of second image will be
= 45/2 / 3/2 = 15 cm.
hence distance of second image from insect = 18 cm.
due to multiple reflections infinite image will be formed