18. A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens.
(a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower?
(b) What would be the diameter of the image of the flower on the film?
(C) What is the nature of camera lens ??
Answers
Answered by
1
Answer:
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Answered by
0
Answer:
Explanation:
(a) u=−20cm=−200mm
f=50mm
v
1
−
u
1
=
f
1
v
1
−
−200
1
=
50
1
v
1
=
50
1
−
200
1
v
1
=
200
3
v=66.6mm=6.66cm
The film should be at a distance of 6.66cm behind the camera lens.
(b) d
1
=5cm=50mm
m=
u
v
=
d
1
d
2
−200
66.6
=
50
d
2
d
2
=16.65mm=1.66cm
(c) It is a convex lens.
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