When an object a is placed 10 cm is front of lens A, the image is real inverted magnified
and formed at a great distance. When the same object is placed in front of lens B at 10
cm, the image formed is real, inverted and same size as the object. [5]
i) What is the focal length of lens A ?
ii) What is the focal length of lens B ?
iii) What is the nature of lens A ?
iv) What is the nature of lens B ?
v) Which of the lens A or B has greater power ?
Answers
Answered by
1
Answer:
(a) The object is placed at focus, so f = 10 cm.
(b) The object is placed at a distance twice the focal length, so f = 5 cm.
(c) Convex lens (since image is real).
(d) Convex lens (since image is real).
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lucifer2005215:
I want the 5th question's answer
Focal length of A=10cm=0.1m
Power of A=1/Focal length
P of A=1/0.1
P of A= 10 Dioptre
Focal length of B=5cm=0.05m
Power of B=1/Focal length
P of B=1/0.05
P of B= 20 Dioptre
Therefore power of B is greater than A
Power of A=1/Focal length
P of A=1/0.1
P of A= 10 Dioptre
Focal length of B=5cm=0.05m
Power of B=1/Focal length
P of B=1/0.05
P of B= 20 Dioptre
Therefore power of B is greater than A
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Answered by
1
Answer:
a) The object is placed at focus, so f = 10 cm.
(b) The object is placed at a distance twice the focal length, so f = 5 cm.
(c) Convex lens (since image is real).
(d) Convex lens (since image is real).
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