Changing the f-number of a camera lens by 4x will change the light intensity admitted to the film by what factor? a) 16 b) 0.0625 c) 2 d) 0.25 e) 4

option B is correct

factor is 0.0625

Explanation:

Given data

camera lens = 4X

to find out

find factor

solution

we know Inverse square law that is the intensity is inversely proportional to the square of the distance from the source i.e f

so we say intensity ( I )  ∝ 1 / f

so I1 / I2 = f2² / f1²

so I2 will be

I2 =   f2² / f1² × I1

I2 =  1 / 4² × I1

I2 = 0.0625

so option B is correct

factor is 0.0625

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//