Question

The age of two friends Namami and Shivu differ by 3 years. Namami's father Rohit is twice as old as Shivu and Shivu is twice as old as his sister Lalitya. The ages of Lalitya and Dharam differ by 30 years. Find the ages of Namami and Shivu.​
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an object 5cm in length is held 30 cm away from a converging lens of focal length 10cm. draw the ray diagram and find the position, size and nature of the image formed
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Answer 1

Answer:

answer 2 :

given

height of object = 5 cm

position of object ,u = 25 cm

focal length of object, f = 10 cm

position of image, v = ?

we know that,

1/v -1/u = 1/f

1/v +1/25= 1/10

1/v = 1/10-1/25

So,

1/v = (5-2)/50

that is ,

1/v = 3/50

So,

v= 50/3 = 16.66 cm

Thus, distance of image is 16.66 cm on the opposite side of lens .

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Answer of 1 question is third photo