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A 10 cm long pencil is placed 5 cm in front of a concave mirror having a radius of curvature of 40 cm.
(i) Determine the position of the image formed by this mirror.
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Answer:
1/π = 1/π£ + 1/π’
Given: π’ = −5ππ, π = π/2 = −20ππ
− 1/20 = 1/π£ − 1/5
1/π£ = − 1/20 + 1/5 = 3/20
π£ = 20/3
= 6.67 ππ
The image is obtained at 6.67m behind the mirror.
(ii) What is the size of the image?
Answer:
m = ℎ2/ℎ1 = − π£/π’ = 20/3/ 5 = 4/3
(iii) Draw a ray diagram to show the formation of the image as mentioned in the part (i).
Answer:
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