2) The power of a thin convex lens is +3,5 D. It is placed in contact with another thin lens, such that the combined power is + 1,0 D. Calculate; a, power of second
lens b. focal length of the second lens,
coniant in designing lensa frontiralinotrument
Answer a.-2.5 D
b.0.4m

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

i believe the answer is a hope it and is correct