10. For a ray of light to be reflected totally internally, angle of incidence must be critical angle. A. Greater than B. Less than C. Equal to D. None of the above.

the answer would be c. motion and direction

i hope this : )

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

2b2t

explanation:

2b2t

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s