Question

A 1 cm high object is placed 10 cm from a concave mirror with the focal length 15 cm. determine:
A. the image distance
B. the image height
C. the properties of image formed by the concave mirror.

Answer 1

Answer:

focal length of concave mirror is -15 cm and object distance is -10 cm using mirror formula 1/f=1/v1+1/u then -1/15=1/v-1/10 ,,, -1/15+1/10=1/v ,,1/v= -2+3/30 ,,1/v=1/30 means v is +30 cm then B). m=Hi/Ho=-v/u using the formula for image height Hi/Ho=-v/u ,,, Hi/1= -(30)/-10 After solving it Hi is +3 cm C). this image form by concave mirror is erect , virtual and behind the mirror