Alarge convex lens stands on the floor. the lens is 180 cm tall, so the principal axis is 90 cm above the floor. a student holds a flashlight 120 cm off the ground, shining straight ahead (parallel to the floor) and passing through the lens. the light is bent and intersects the principal axis 60 cm behind the lens. then the student moves the flashlight 30 cm higher (now 150 cm off the ground), also shining straight ahead through the lens. how far away from the lens will the light intersect the principal axis now? a. 30 cm b. 60 cm c. 75 cm d. 90 cm

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min