An object is placed 5.5 cm in front of a thin converging lens, and its image forms 12 cm from the lens on the same side as the object. What is the focal length of the lens? 10 cm
6.2 cm
-8.6 cm
8.6 cm

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?