Question

Question 25 Accm tall object is placed 40 cm away from a converging lens of a focal length 60cm Which of the following statements pertaining to the image formed by this lensis CORRECT? 1 pts one of the choices given here The 250 on the sides object Therapist 12 cm 120 cm on the same sides object The image is 25 cm 30cm on the other side of the lens The image 12 omtalt 120cm on the other side of the lens Question 26 An object is placed 10 cm from a concave mirror of focal length 20 cm What is the magnification! 1 pts 15 10 25 20 30

Answer 1

1) using lens formula,

1/f = 1/v - 1/u

1/v = 1/60-1/40

v = - 120 cm

Hi = 120*4/40

Hi = 12 cm, virtual

Option c) is the correct answer

2) using mirror formula

1/f = 1/u + 1/v

1/v = 1/-20 +1/10

v = - 20 cm

M = - v/u

M = 20/10

M = 2

Option d)