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PHYSICS

JAMB 2010 - Question 29

Physics 2010 JAMB Past Questions - Question 29: An object 4cm high is placed 15cm . The size of the image is

Choose the correct answers from the options given.

An object 4cm high is placed 15cm . The size of the image is

A: 3cm

B: 5cm

C: 4cm

D: 2cm

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Correct Answer

Explanation

(1)/v + (1)/u = (1)/f
(1)/v + (1)/15 = (1)/5
(1)/v = (1)/5 - (1)/15 = (3 - 1)/15 = (2)/15
∴ v = (15)/2 = 7.5 cm
magnification = (v)/u = (image size)/object size
(7.5)/15 = (X)/4
∴ image size. X = (7.5 x 4)/15 = 2 cm