A diverging lens of focal length 10cm an object is placed 20cm away from the lens .find the image distance and find the magnificantion
Answers
Answer:
Explanation:
u = -20 cm
(a) f = 15 cm (for converging lens)
1/v – 1/u = 1/f
1/v – 1/-20 = 1/15
1/v = 1/15 – 1/20
1/v = 1/60
V = 60 cm
m = v/u = 60/-20 = -3
(b) f = -15 cm (for diverging lens)
1/v – 1/u = 1/f
1/v – 1/-20 = 1/-15
1/v = - (1/15) – 1/20
1/v = -7/60
V = -8.57 cm
m = -v/u = -8.57/-20 = + 0.42
Q.1 Read the following passage carefully.
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Surya singh, prince of manipur, one came to the city of Delhi on business
but because it was secret, he did not bring any servant with him. This
explains why a man like the prince was travelling alone. On the way he saw
a man who was weak and tired. The man was sitting beside the road.
"Which way are you going" "Good sir", was the reply. " I am going to Delhi
and must be there night, but I shall never reach the city because I am tired"
Surya Singh got off the horse and told the man to get on it in stead of him.
The man seemed to be waiting for this offer and he gladly got on the horse.
Surya singh walled beside him. At the city he asked the man to get down.
The man looked surprised "Why should 1 get off my horse he said:
Q.1 Who was the prince of manipur?
Q.2 Why did Surya singh come to Delhi?
Q.3 Why was Surya Singh travelling alone?
Q4 Where did Surya singh meet the man?
Q.5 How did the man look?
Q.6 What was the man doing?
Q.7 Who, trom among, surya singh and the man is good human being?
Q.8 What was the man's reply about going to Delhi?
Q9 What did the man say to Surya Singh at the city?
Q.10 Find words from the passage which mean:
) A sovereign's son
(i) Happy