the lens. The focal length of the convex lens is 20 cm.
The results were recorded in the following table.
Object distance (in cm)
25
30
40
60
120
Image distance (in cm)
100
24
60
30
40
Unfortunately, his results are written in the wrong order.
19.1 What is the nature and size of the image when the object is placed at 2F1
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Answered by
2
Answer:
what is the question what do you want to ask
Answered by
2
Answer:
(a) 100 cm; 60 cm; 40 cm; 30 cm; 24 cm
(b) When u = – 25 cm, v = 100 cm
Explanation:
a) 100 cm; 60 cm; 40 cm; 30 cm; 24 cm
(b) When u = – 25 cm, v = 100 cm
1/v – 1/u = 1/f
1/100 – 1/-25 = 1/f
1/f = 5/100
f = 20 cm
When u = -90 cm, v =?
1/v – 1/u = 1/f
1/v – 1/-90 = 1/20
1/v – 1/20 = 1/90
1/v = 7/180
V = 25.7 cm
(c) 25 cm
(d) 20 cm (As calculated in part (b))
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