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If a convex lens of focal length 12cm is used to produce a real image four...

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Question 45

If a convex lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?

A

10 cm

B

15 cm

C

20 cm

D

25 cm

Explanation

Share Answer Magnifications = ^V/_U = 4
V = 4U
¹/_V + ¹/_U = ¹/_f
¹/_4u + ¹/_U = ¹/₁₂
⁵/_4U = ¹/₁₂
4U = 12 x 5 = 60
U = 15 cm

Correct option: B

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