Solve the all given parts of following problem:
Problem: A lamp which is 11.0 cm tall is in front of a concave mirror which has a focal length of 51.5 cm.
Part A: How tall is the lamp's image if the lamp is a distance of 25.8 cm from the mirror (include sign if negative)?
___cm
Part B: How tall is the lamp's image if the lamp is a distance of 92.7 cm from the mirror (include sign if negative)?
____ cm
Part C: How tall is the lamp's image if the lamp is a distance of 159.7 cm from the mirror (include sign if negative)?
___cm
This is a physic problem, reply as soon as possible. Thanks.