Question

Problem 23.10 Part A A small candle is 31 cm from a concave mirror having a radius of curvature of 22 cm What is the focal length of the mirror? Follow the sign conventions Express your answer to two significant figures and include the appropriate units. Value Units Submit My Answers Give Up Part B Where will the image of the candie be located? Follow the sign conventions Express your answer to two significant figures and include the appropriate units. dValue Units Submit My Answers Give Up

Answer 1

Part A

Focal length = radius of curvature/2

f = - 22/2 = - 11 cm. Ans.

Part 2

Using mirror formula,

1/u + 1/v = 1/f

1/(-31) + 1/v = 1/(-11)

1/v = -1/11 + 1/31

v = (11 × 31)/(11 - 31)

= - 17.05 cm

= - 17 cm